Audi TT 13 User Manual

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Service
Workshop Manual
Audi 100 1991 ➤ , Audi 80 1992 ➤ ,
Audi A1 2011 ➤ , Audi A2 2001 ➤ , Audi A3 1997 ➤ , Audi A3 2004 ➤ , Audi A4 1995 ➤ , Audi A4 2001 ➤ , Audi A4 2008 ➤ , Audi A4 Cabriolet 2003 ➤ , Audi A5 Cabriolet 2009 ➤ , Audi A5 Coupé 2008 ➤ , Audi A6 1995 ➤ , Audi A6 1998 ➤ , Audi A6 2005 ➤ , Audi A8 1994 ➤ , Audi A8 2003 ➤ , Audi A8 2010 ➤ , Audi Cabriolet 1991 ➤ , Audi Q5 2008 ➤ , Audi Q7 2007 ➤ , Audi R8 2007 ➤ , Audi TT 1999 ➤ , Audi TT 2007 ➤
Wheels and tyres
Edition 02.2010
Service Department. Technical Information
Page 2
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG.
Service
List of Workshop Manual Repair GroupsList of Workshop Manual Repair GroupsList of Workshop Manual Repair Groups
Re pa ir G ro up
44 - Wheels, tyres, vehicle geometry
Technical information should always be available to the foremen and mechanics, because their careful and constant adherence to the instructions is essential to ensure vehicle road-worthiness and safety. In addition, the normal basic safety precautions for working on motor vehicles must, as a matter of course, be observed.
All rights reserved. No reproduction without prior agreement from publisher.
Copyright © 2010 Audi AG, Ingolstadt A00ARRA0020
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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Wheels and tyres - Edition 02.2010
Contents
44 - Wheels, tyres, vehicle geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1 Fitting wheels / tyres / tyre pressure monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 General information on wheels and tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Exploded view of components for light alloy wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 Exploded view of components for PAX run-flat tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 Instructions for changing/fitting wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Tightening torques for wheel bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.6 Removing and fitting run-flat tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.7 Safety notes for run-flat tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.8 Conditions for fitting run-flat tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.9 Unseating run-flat tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.10 Removing run-flat tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.11 Fitting run-flat tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.12 Exploded view of tyre pressure monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.13 Changing a tyre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.14 Removing and installing metal valve body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1.15 Wheel electronics (TPM) - Beru system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.16 Wheel electronics (TPM) - Siemens system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2 Tyre requirements and tyre maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.2 Requirements to be met by tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.3 Factors influencing the service life of a tyre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.4 Tyre pressure (maintenance) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.5 Driving style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.6 Measuring tread depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.7 Useful information regarding tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.8 Identification markings on the tyre sidewall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.9 Designations on sidewall of tyres with run-flat system (PAX) . . . . . . . . . . . . . . . . . . . . . . 28
2.10 Speed rating / maximum speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.11 Load rating code/load index (LI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.12 The valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.13 Tyre storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.14 Storing the tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.15 Tyre ageing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.16 Renewing tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.17 Care and maintenance of alloy wheel rims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.18 Tyres with rim protectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3 Tyre wear/ mileage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.1 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.2 Wear of high-speed tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.3 Evenly worn tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.4 One-sided wear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.5 One-sided wear – adjustment error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.6 Wear in middle of tyre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.7 Diagonal erosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.8 SA 18 - Wear; SA 11 - Adjustment error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3.9 Running gear modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4 Tyre noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.1 General notes on tyre noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.2 Useful information regarding tyre noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.3 Saw-tooth wear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.4 Flat spots (brake-flatting) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Contents i
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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ... Wheels and tyres - Edition 02.2010
5 Rough running caused by wheels/tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.1 Causes of rough running . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.2 Flat spots caused by storage or handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6 Balancing wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.1 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.2 Conducting a road test before balancing wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.3 Balancing wheels on stationary wheel balancing machine . . . . . . . . . . . . . . . . . . . . . . . . 45
6.4 Work sequence when balancing wheels and tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.5 Finish balancer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.6 Vibration control system VAS 6230 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.7 Radial and lateral run-out on wheels and tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.8 Checking radial and lateral run-out of wheels and tyres on V.A.G 1435 . . . . . . . . . . . . . . 49
6.9 Checking radial and lateral run-out on wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.10 Matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
7 Vehicle pulls to one side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.1 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.2 Remedies when vehicle pulls to one side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.3 Strategic rotation of wheels for non-directional tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7.4 Strategic rotation of wheels for unidirectional tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8 Tyre damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
8.1 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
8.2 Checking tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
8.3 Construction of belted radial tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.4 Torn tread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
8.5 Radial depressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
8.6 Impact damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
8.7 Cuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
8.8 Damage caused by foreign bodies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
8.9 Loss of air from tyre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8.10 Damage occurring when fitting tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8.11 Bead damage caused by fitting machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
8.12 Tyre pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
8.13 Tyre damage due to insufficient inflation pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
8.14 Slow loss of tyre pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
8.15 Temperature increase caused by insufficient inflation pressure . . . . . . . . . . . . . . . . . . . . 64
8.16 Tears in tyre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
9 Vehicles with breakdown set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.1 Tyre sealant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.2 Removing a tyre from the rim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.3 Disposal of sealant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
9.4 Fitting a new tyre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10 Tyre pressure monitoring systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
10.1 Tyre pressure monitoring system with pressure sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
10.2 Tyre pressure monitoring with wheel speed sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
11 Temporary spare wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
11.1 Notes on the use of temporary spare wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
12 Tyres with run-flat capability (PAX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
12.1 Construction of tyres with run-flat capability (PAX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
12.2 Codes and designations on tyres with run-flat capability (PAX) . . . . . . . . . . . . . . . . . . . . . . 72
12.3 Support ring on PAX wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
12.4 Dimensions and designations for PAX rims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
12.5 Inflating tyres on PAX wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
12.6 Wheel alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
12.7 Repairing tyres with run-flat capability (PAX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
ii Contents
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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Wheels and tyres - Edition 02.2010
12.8 PAX tyres - assessing condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
12.9 Checking support ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
13 Self supporting tyres (SST) with run-flat capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
13.1 Design of an SST tyre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
13.2 Servicing tyres with run-flat capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
13.3 Renewing tyres/conditions for use of run-flat tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Contents iii
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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ... Wheels and tyres - Edition 02.2010
iv Contents
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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Wheels and tyres - Edition 02.2010
44 – Wheels, tyres, vehicle geometry
1 Fitting wheels / tyres / tyre pressure
monitor

1.1 General information on wheels and tyres

The factory recommends using tyres of the same make, design and tread pattern on all wheels.
Always renew the rubber valve when fitting a new wheel rim or tyre.
Tyres are to be fitted with DOT mark facing outer side of wheel. For tyres with directional tread pattern, this only applies to left side of vehicle.
If the vehicle is fitted with tyres with a directional tread pattern, the spare wheel should have a wheel/tyre combination for the right-hand side of the vehicle.

1.2 Exploded view of components for light alloy wheels

Overview of light alloy wheel
Wheel change/wheel fitting instructions ⇒ page 4

1. Fitting wheels / tyres / tyre pressure monitor 1

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ... Wheels and tyres - Edition 02.2010
1 - Tyre
2 - Valve
❑ Always renew ❑ Use only correct valves
as specified in ⇒ ETKA
3 - Wheel
❑ Observe the fitting in‐
structions ⇒ page 4
4 - Wheel bolt
❑ Observe the fitting in‐
structions ⇒ page 4
❑ Tightening torques for
wheel bolts
⇒ page 9
❑ Anti-theft wheel bolt
⇒ page 2
5 - Adapter for wheel bolt
❑ Attach to corresponding
wheel bolt ⇒ page 2
6 - Cap for wheel bolts
7 - Trim cap
8 - Wheel bolt
❑ Observe the fitting in‐
structions ⇒ page 4
❑ Tightening torques for
wheel bolts
⇒ page 9
9 - Adhesive balancing weights
❑ Not more than 60 g per‐
mitted per rim flange
❑ Remove dirt and grease
from wheel rim at bonding point ❑ Pull off backing foil ❑ Bond on balancing weights at surfaces provided for this purpose
Anti-theft wheel bolt
1 - Anti-theft wheel bolt
2 - Cover cap
3 - Adapter for wheel bolt
2 Rep. Gr.44 - Wheels, tyres, vehicle geometry
Page 9
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Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Wheels and tyres - Edition 02.2010

1.3 Exploded view of components for PAX run-flat tyres

1 - PAX tyre
2 - Support ring
3 - Wheel for PAX tyre
❑ Observe the fitting in‐
structions ⇒ page 4
4 - Wheel electronics
❑ All batteries must be re‐
newed together
❑ Remaining service life,
temperature and infla‐ tion pressure can be read out via diagnosis function with vehicle di‐ agnostic, testing and in‐ formation system ­VAS 5051-
5 - Metal valve body
❑ Use only correct valves
as specified in ⇒ ETKA
❑ Supplied as complete
unit
6 - Wheel bolt
❑ Observe the fitting in‐
structions ⇒ page 4
❑ Tightening torque for
wheel bolts
⇒ page 9
❑ Anti-theft wheel bolt
⇒ page 2
7 - Adapter for wheel bolt
❑ Attach to corresponding
wheel bolt ⇒ page 2
8 - Cap
❑ Attach to wheel bolt
9 - Two-piece wheel bolt
❑ Observe the fitting instructions ⇒ page 4 ❑ Tightening torques for wheel bolts ⇒ page 9
10 - Trim cap
11 - Cap for wheel bolts
12 - Adhesive balancing weights
❑ Not more than 60 g permitted per rim ❑ Remove dirt and grease from wheel rim at bonding point ❑ Pull off backing foil ❑ Bond on balancing weights at surfaces provided for this purpose
1. Fitting wheels / tyres / tyre pressure monitor 3
Page 10
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Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ... Wheels and tyres - Edition 02.2010

1.4 Instructions for changing/fitting wheels

Note
The width across flats of the wheel bolt adapter supplied with the vehicle can differ from that of the adapter in the workshop adapter set.
Special tools and workshop equipment required
♦ Torque wrench -V.A.G 1332-
♦ Adapter set for tamper-proof wheel bolts -T10101-
♦ Adapter set for tamper-proof wheel bolts -T10101 A-
♦ Adapter set for tamper-proof wheel bolts -T40004-
4 Rep. Gr.44 - Wheels, tyres, vehicle geometry
Page 11
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Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
♦ Adapter set for tamper-proof wheel bolts -T40073-
♦ Wax spray -D 322 000 A2-
♦ Optimol TA paste -G 052 109 A2-
Wheel change
Caution
On vehicles with ceramic brakes the wheel must not be allowed to drop onto the brake disc. This would cause irreparable dam‐ age to the disc. When removing or fitting a wheel, screw the long assembly pin into the top wheel bolt hole (12 o'clock po‐ sition) in place of the wheel bolt, and screw the short pin into one of the other holes to support the wheel. The wheel can then slide along the assembly pins when fitting or removing it.
Wheels and tyres - Edition 02.2010
Note
Raise vehicle only at jacking points provided.
Do not use screwdriver to pry off trim caps on vehicles with light-alloy wheels; always use special tool provided (puller from vehicle tool kit).
To slacken off wheel bolts, always use socket attachments of the correct size. Worn socket attachments must not be re­used.
Do not use impact wrenches for slackening off anti-theft wheel bolts (lockable wheel bolts).
Take care to keep wheel bolts clean.
DANGER!
Perform the checks and follow the instructions listed below. This is important to ensure that the wheel bolts and the wheels are properly secured.
Perform the following steps with the wheel rim removed.
1. Fitting wheels / tyres / tyre pressure monitor 5
Page 12
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– Check that contact surfaces -arrows- on brake disc/wheel hub
or brake disc/brake drum and wheel (rim) are free of corrosion and dirt.
– Remove any oil, grease and corrosion.
– Check that centring flange on wheel hub -arrow- is free of cor‐
rosion and dirt.
– Check that contact surfaces -arrow- on inside of wheel rim and
centring seat in rim are free of corrosion and dirt.
6 Rep. Gr.44 - Wheels, tyres, vehicle geometry
Page 13
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– The convex seats in the holes for the wheel bolts on the rim
must be free of corrosion, dirt, oil and grease.
– Remove any oil, grease, dirt and corrosion and apply wax
spray -D 322 000 A2- around centring hole/flange to ensure corrosion protection.
Note
The wax spray must not come into contact with brake system components.
Any rust or dirt which drops between brake disc and wheel hub on removal should be blown out with compressed air.
DANGER!
Wear safety goggles when working with compressed air.
The convex seats for the wheel bolts in the wheel rim and the
shoulders on the wheel bolts must be free from dirt and corrosion.
– If necessary, clean the seats for the wheel bolts in the rim using
a clean, lint-free cloth.
Wheels and tyres - Edition 02.2010
– Check that the wheel bolts and the threads in the wheel hub
are clean.
– Use a brass wire brush or similar to remove any dirt from the
shoulder and threads of the wheel bolts.
WARNING
Damaged or badly corroded wheel bolts must be renewed.
1. Fitting wheels / tyres / tyre pressure monitor 7
Page 14
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If lightly corroded wheel bolts are re-installed on the vehicle, clean the threads and the shoulders on the bolt heads and grease the surfaces in sliding contact using Optimol TA paste -G 052 109 A2­as follows (all vehicles except RS 2 and RS 4, Type 8D):
A - One-piece wheel bolt. Lightly grease thread -2- and shoulder
-1-.
B - Two-piece wheel bolt. Lightly grease thread -3-, and area be‐ tween bolt head contact surface -6- and back of convex washer
-5-. Do not apply grease to the convex surface -4- that bears against the wheel rim.
Note
Use only Optimol TA paste -G 052 109 A2- . The paste must not come into contact with parts of the brake system.
Only for RS 2 and RS 4 (Type 8D):
Slightly corroded wheel bolts are not to be cleaned and greased. They must always be renewed.
Wheel bolts are always to be screwed in without grease.
All vehicles (continued):
– Check that wheel bolts can be screwed in easily by hand with‐
out using tools. When fitting the wheel, the bolts should screw in easily over the full length of the threads.
– Make sure the holes in the hub align. The thread of the wheel
bolts must not contact the bore in the brake disc.
– If the thread of the wheel bolt touches the hole, turn the brake
disc relative to the wheel hub accordingly.
Fitting wheels:
♦ Position wheel on wheel hub and secure by hand with two op‐
posing wheel bolts.
♦ Screw in remaining wheel bolts by hand. They should screw
in easily. Make sure the bores are exactly centralised.
♦ If necessary lift the wheel slightly and tighten two wheel bolts
lightly by hand.
♦ When fitting the wheel, screw in all wheel bolts uniformly by
hand.
♦ Tighten the wheel bolts diagonally using, for example, a four-
arm wheel nut wrench, to about 30 Nm.
WARNING
Do not use an impact wrench to screw in the wheel bolts.
8 Rep. Gr.44 - Wheels, tyres, vehicle geometry
Page 15
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Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
– If necessary, take the weight off the wheel by lifting it slightly.
– Lower vehicle to floor and tighten all wheel bolts in diagonal
sequence to final specified torque ⇒ page 9 .
– Lower vehicle onto its wheels. ⇒ Running gear, front-wheel
drive and four-wheel drive; Rep. Gr. 44 ; Wheels, tyres, vehi‐ cle geometry

1.5 Tightening torques for wheel bolts

Model Type Tightening torque
RS 2 895 130 Nm RS 4 8D 140 Nm
A1 8X 120 Nm A2 8Z 120 Nm A3 8P 120 Nm S3 8P 120 Nm
A3 Cabriolet 8P 120 Nm
A4 8E 120 Nm S4 8E 120 Nm
RS 4 8E 120 Nm A4 B8 8K 120 Nm S4 B8 8K 120 Nm
A4 allroad 8K 120 Nm
RS 4 B8 8K 120 Nm A5 Coupé 8T 120 Nm S5 Coupé 8T 120 Nm
A5 Sportback 8T 120 Nm
A5 Cabriolet 8F 120 Nm S5 Cabriolet 8F 120 Nm
A6 4B / 4F 120 Nm
A6 allroad 4B / 4F 120 Nm
S6 4B / 4F 120 Nm
RS 6 4B / 4F 120 Nm
A8 4D / 4E / 4H 120 Nm TT 8N / 8J 120 Nm R8 42 120 Nm Q5 8R 140 Nm
Q7 4L 160 Nm Q7 - 12-cylinder 4L 160 Nm PAX wheels, A6 4B / 4F 120 Nm PAX wheels, A8 4D / 4E / 4H 140 Nm
A6 (Security) 4B / 4F 120 Nm A8 (Security) 4D / 4E / 4H 140 Nm
All other Audi models
120 Nm
Wheels and tyres - Edition 02.2010
1. Fitting wheels / tyres / tyre pressure monitor 9
Page 16
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1.6 Removing and fitting run-flat tyres

Safety notes for run-flat tyres ⇒ page 10
Conditions for fitting run-flat tyres ⇒ page 10
Unseating run-flat tyres ⇒ page 12
Removing run-flat tyres ⇒ page 12
Fitting run-flat tyres ⇒ page 14

1.7 Safety notes for run-flat tyres

Run-flat tyres must be installed and/or removed by specially trained mechanics.
The required special tools must be undamaged and in perfect working order. For information on suitable additional tools and materials, please contact the manufacturer of your tyre fitting unit directly. For listed tyre fitting units with VAS numbers, the additional tools and materials are available as recommended accessories.
Where applicable, use the assembly paste recommended by the tyre manufacturer.
The description of the procedures for removing and fitting tyres may vary depending on the equipment manufacturer and type of unit.
The basic procedures for removing and fitting run-flat tyres are described below. Before starting work on a tyre, it is important to establish whether it is likely to be a run-flat tyre, and to follow the correct procedures when removing or fitting it.
You can identify run-flat tyres from any of the following abbre‐ viations: DSST, Euforia, RFT, ROF, RSC, SSR or ZP. These abbreviations are located on the sidewall after the tyre desig‐ nation.
Please always observe the instructions and warnings in the following description.
Check whether the tyre pressure sensor has to be renewed (if fitted) ⇒ Vehicle diagnosis, testing and information system VAS 5051.
Note
Ensure that the tyre does not come into contact with the tyre pressure sensor during removal and fitting work.
When cleaning the wheel rim, the tyre pressure sensor must not be allowed to come into contact with water and must not be blown out with compressed air.

1.8 Conditions for fitting run-flat tyres

Allowing cold tyres to warm up to minimum fitting temperature
Note
This procedure also applies to ultra high performance tyres (height/width ratio 45 % or less and speed symbol V or higher).
10 Rep. Gr.44 - Wheels, tyres, vehicle geometry
Page 17
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WARNING
The fitting temperature of a tyre must not be less than 15 °C and must not exceed 30 °C at the core.
To prevent injury when fitting the tyre, the temperature of the tyre (in particular the temperature of the upper sidewall and upper bead inside the tyre) must be at least 15 °C.
This internal temperature is referred to as the core tempera‐ ture.
Since rubber is a poor heat conductor, a cold tyre must be stored in a temperate environment until the internal rubber layers have warmed up to at least 15 °C.
The surface temperature of the tyre during the warm-up phase is not indicative of the internal temperature.
The quickest way for the tyres to absorb heat from the ambient air is to allow the warm air to circulate around them freely. For this purpose, they should be stored separately and NOT stacked.
Never use a heater or hot air blower to warm up the tyres, as critical surface temperatures can build up extremely quickly.
There is no way to heat the tyres without damaging them other than using warm water or warm ambient air (max. 50 °C).
If cold tyres (below 0 °C) are brought into a warm environment (above 0 °C), a layer of frost will immediately form on the sur‐ face of the tyre. This layer of frost, which forms from the condensation of moisture in the air, is a sign that the tyre is rapidly absorbing heat from the ambient surroundings.
When the layer of frost has thawed completely leaving a film of condensate, you should wipe the tyre dry with a cloth to prevent the evaporative cooling effect from slowing down the warm-up process.
Warm-up times:
Wheels and tyres - Edition 02.2010
♦ Assuming a minimum room temperature of 19 °C and a tyre
temperature of 0 °C or higher, the tyre should be stored for at least 2 hours.
♦ Assuming a minimum room temperature of 19 °C and a tyre
temperature of below 0 °C, the tyre should be stored for at least 2.5 hours.
Recommendations for warm-up:
♦ Make it part of your routine job preparation to store the tyres
in the workshop 1 day before fitting them (if possible).
♦ Store the tyres as high up as possible on an insulated surface,
such as a wood pallet or similar.
♦ Keep the tyres separate so that the warm air can circulate
around them freely.
♦ Wipe off condensate.
♦ Never use a heater or hot air blower to warm up the tyres.
1. Fitting wheels / tyres / tyre pressure monitor 11
Page 18
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1.9 Unseating run-flat tyres

Caution
♦ Observe safety notes ⇒ page 10
– Release air from tyre by unscrewing nickel-plated valve core.
– When using a tyre fitting machine with bead breaker to unseat
the tyre, always make sure that the tyre valve/ tyre pressure sensor -arrow- is on the opposite side to the bead breaker
-1-.
Apply the bead breaker not more than 2 cm away from the wheel flange.
– Remove balancing weights and coarse dirt from wheel.
– Unseat both tyre beads all round and apply a generous
amount of tyre fitting lubricant between tyre and wheel flange
-arrow-.

1.10 Removing run-flat tyres

Caution
♦ Observe safety notes ⇒ page 10
12 Rep. Gr.44 - Wheels, tyres, vehicle geometry
Page 19
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– Turn wheel on tyre fitting unit so that tyre valve/ tyre pressure
sensor -2- is in front of head of fitting unit -1-.
Caution
Maintain clearance -a- between head of fitting unit -1- and tyre valve/tyre pressure sensor; otherwise the head will damage the tyre pressure sensor .
– Position head of fitting unit -1- close to tyre valve/ tyre pressure
sensor so that tyre iron can be applied approx. 30° away from tyre valve/ tyre pressure sensor -2-.
– Attach retainers -3- to wheel on opposite side to head of fitting
unit -1-.
– Now use tyre iron to lever bead over finger on head of fitting
unit. Remove tyre iron after doing so.
– Run tyre fitting unit in clockwise direction until upper bead is
completely over wheel flange.
Retainers -1- will be pushed against head of fitting unit. They can then be easily removed.
Wheels and tyres - Edition 02.2010
– Turn wheel on tyre fitting unit so that tyre valve/ tyre pressure
sensor -2- is in front of head of fitting unit -1-.
Caution
Maintain clearance -a- between head of fitting unit -1- and tyre valve/tyre pressure sensor; otherwise the head will damage the tyre pressure sensor .
– Position head of fitting unit -1- close to tyre valve/ tyre pressure
sensor so that tyre iron can be applied approx. 30° away from tyre valve/ tyre pressure sensor -2-.
– Now use tyre iron -3- to lever bead over finger on head of fitting
unit.
– Apply an additional plastic lever -4-.
– Remove tyre iron -3- again.
1. Fitting wheels / tyres / tyre pressure monitor 13
Page 20
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– Use plastic lever -1- to hold bead over wheel flange from out‐
side and run tyre fitting unit in clockwise direction until tyre has been pulled completely off wheel flange.
Note
Check tyre pressure sensor for loose or damaged parts. If screw-on connections are loose, replace union nut, valve core, seal, sealing washer and valve cap with new parts from repair kit ⇒ Electronic parts catalogue “ETKA” .
If tyre pressure sensor is damaged, renew it completely.

1.11 Fitting run-flat tyres

Caution
♦ Note conditions for minimum fitting temperature
⇒ page 10
♦ Observe safety notes ⇒ page 10
– Apply a generous amount of tyre fitting lubricant to wheel
flanges, tyre beads and area inside upper tyre beads.
– Turn wheel on tyre fitting unit so that tyre valve/ tyre pressure
sensor -1- is on opposite side to head of fitting unit -2-.
– Run tyre fitting unit in clockwise direction.
– Stop fitting lower bead before tyre valve/ tyre pressure sensor
-arrow- reaches tool; otherwise tyre pressure sensor will be damaged.
Tyre bead will now slip over wheel flange. Make sure that tyre fitting unit stops turning wheel before tyre valve/ tyre pressure sensor -arrow- reaches head of fitting unit.
14 Rep. Gr.44 - Wheels, tyres, vehicle geometry
Page 21
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– Turn wheel on tyre fitting unit so that tyre valve/ tyre pressure
sensor -1- is on opposite side to head of fitting unit -2-.
– Attach retainers -3- to wheel.
– Ensure that tyre bead is seated correctly on head of fitting unit
and run tyre fitting unit in clockwise direction.
– Stop fitting upper bead before tyre valve/ tyre pressure sensor
-arrow- reaches tool; otherwise tyre pressure sensor will be damaged.
Tyre bead will now slip over wheel flange. Make sure that tyre fitting unit stops turning wheel before tyre valve/ tyre pressure sensor -arrow- reaches head of fitting unit.
– Remove retainers from wheel flange.
– Inflate tyre to max. 3.3 bar (bead seating pressure).
Caution
Wheels and tyres - Edition 02.2010
Do not continue inflating the tyre if the beads do not make full contact at the edge of the wheel.
The tyre or wheel will otherwise be damaged.
– If tyre beads do not make full contact at edge of wheel, release
air from tyre, press off tyre bead again and apply another gen‐ erous coating of tyre fitting lubricant to wheel flange.
– Inflate tyre to max. 3.3 bar (bead seating pressure).
– Once tyre beads have made proper contact with bead seats,
increase inflation pressure to 4 bar to seat the tyre.
– Screw in a new nickel-plated valve core and inflate tyre to
specified pressure.
– Then balance the wheel.
– Fit wheel to vehicle and tighten to specified torque.

1.12 Exploded view of tyre pressure monitor

Wheel electronics (Beru system) ⇒ page 20
Wheel electronics (Siemens system) ⇒ page 21
Direct measuring systems according to vehicle type
⇒ page 18
Indirect measuring systems according to vehicle type
⇒ page 18
1. Fitting wheels / tyres / tyre pressure monitor 15
Page 22
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Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ... Wheels and tyres - Edition 02.2010
Note
The marking on the wheel electronics indicates which system is installed.
1 - Metal valve body
❑ Use only correct valves
as specified in ⇒ ETKA
❑ Supplied as complete
unit
❑ Always renew valve
core when changing tyre
❑ Removing and installing
⇒ page 18
2 - Valve core
3 - Seal
❑ Removing and installing
⇒ page 18
Note
4 - Rim
❑ All models: 4 Nm ❑ Removing and fitting
tyre ⇒ page 17
Removing run-flat tyres
⇒ page 12
5 - Wheel electronics
❑ All batteries must be re‐
newed together
❑ Remaining service life,
temperature and infla‐ tion pressure can be read out via diagnosis function with vehicle di‐ agnostic, testing and in‐ formation system ­VAS 5051B- or -
VAS 5052­❑ Installing wheel electronics (Beru system) ⇒ page 20 ❑ Installing wheel electronics (Siemens system) ⇒ page 21
Note
WARNING
After using tyre sealant, the wheel electronics on the affected wheel must be renewed.
16 Rep. Gr.44 - Wheels, tyres, vehicle geometry
Page 23
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WARNING
The wheel electronics must be renewed if dam‐ aged.
6 - Micro-encapsulated bolt
Note
All models: 4 Nm
❑ Renew bolt ❑ Replacement part only available together with wheel electronics ❑
7 - Union nut
❑ Removing and installing ⇒ page 18 ❑ Tightening torque ⇒ page 18
8 - Chamfered washer
Wheels and tyres - Edition 02.2010

1.13 Changing a tyre

The valve core must always be renewed if a tyre is changed.
The metal valve and the wheel electronics can be reused.
– Release air from tyre by unscrewing nickel-plated valve core.
– Remove tyre ⇒ page 17
Removing run-flat tyres ⇒ page 12
– Perform visual inspection to check for loose or damaged com‐
ponents. Renew complete valve assembly if attachment points are loosened/detached.
Note
Always renew damaged wheel electronics.
Removing tyre
Roll off or unseat tyre.
When using an unseating tool, first press off the tyre on the side
opposite the valve.
Unseating tools must not be used in hatched area -a-.
– Position head of installing tool close to valve so that tyre iron
can be applied approx. 30° -b- away from valve.
– Then pull off the tyre in the valve area first.
Fitting run-flat tyres ⇒ page 14
1. Fitting wheels / tyres / tyre pressure monitor 17
Page 24
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Fitting tyre
Unseating tools must not be used in valve area.
– Position wheel electronics approx. 180° opposite head of in‐
stalling tool.
– Press tyre into well base approx. 90° in front of installing tool
-arrow-.
– Screw in new nickel-plated valve core.
– Fit tyre.
– Inflate tyre and screw plastic cap back on.
– Balance tyre.
– Fit wheel.

1.14 Removing and installing metal valve body

Special tools and workshop equipment required
♦ Torque wrench -V.A.G 1410- and tool insert -V.A.G 1331-
(11 mm)
– Push metal valve with rubber seal through the rim from the
inside.
– Fit the chamfered washer and union nut from outside and
screw in by hand.
– Tighten union nut.
Tightening torque of union nut
Model,
System Country Nm
type
A8, 4D Direct measurement,
A8, 4E Direct measurement,
A6, 4B Direct measurement,
A6, 4F Direct measurement,
RS 6, 4F Direct measurement,
Q7, 4L Direct measurement,
Q7, 4L -
Direct measurement,
12-cylin‐
Beru
Beru
Beru
Beru
Beru
Beru
Beru
1)
1)
1)
1)
1)
1)
1)
USA and Rest of
World
USA and Rest of
World
USA and Rest of
World
USA and Rest of
World
USA and Rest of
World
USA and Rest of
World
USA and Rest of
World
4 Nm
4 Nm
4 Nm
4 Nm
6 Nm
4 Nm
4 Nm
der
18 Rep. Gr.44 - Wheels, tyres, vehicle geometry
Page 25
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Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Wheels and tyres - Edition 02.2010
Model,
System Country Nm
type
R8, 42 Direct measurement,
TT, 8J Direct measurement,
Siemens
TT, 8J
Indirect measurement
A3, 8P Direct measurement,
Siemens
A3, 8P
Indirect measurement
A4, 8E Direct measurement,
A4, 8K Direct measurement,
Siemens
A4, 8K
Indirect measurement
A5, 8T Direct measurement,
Siemens
A5, 8T
Indirect measurement
S5, 8T Direct measurement,
Siemens
S5, 8T
A5 Cab‐
riolet, 8F
A5 Cab‐
Indirect measurement
Direct measurement,
Siemens
Indirect measurement
riolet, 8F
Q5, 8R Direct measurement,
Siemens
Q5, 8R
Indirect measurement
1)
Beru
1)
1)
1)
Beru
1)
1)
1)
1)
1)
USA and Rest of
World
USA 8 Nm
2)
Rest of World ------
USA 8 Nm
3)
Rest of World ------
USA and Rest of
World
USA 8 Nm
2)
Rest of World ------
USA 8 Nm
2)
Rest of World ------
USA 8 Nm
2)
Rest of World ------
USA 8 Nm
2)
Rest of World ------
USA 8 Nm
2)
Rest of World ------
6 Nm
4 Nm
All other models: 4 Nm
1) Tyre pressure monitoring (TPM): direct measurement. Wheel electronics fitted at metal valve on wheel; values for pressure and temperature periodically trans‐ mitted to vehicle and evaluated.
2) Tyre monitor display (TMD+): indirect measurement. No electronic components installed in wheel. Rolling circumference and vibration characteristics of the indi‐ vidual wheels are compared by analysing signals from ABS sensors. A loss of tyre pressure is diagnosed indirectly. The speed and vibration characteristics of the wheel change in the event of a drop in the inflation pressure.
3) Tyre monitor display (TMD): indirect measurement. No electronic components installed in wheel. Rolling circumference of the individual wheels is compared by analysing signals from ABS sensors. A loss of tyre pressure is diagnosed indi‐ rectly. The speed of the wheel changes in the event of a drop in the inflation pressure.
1. Fitting wheels / tyres / tyre pressure monitor 19
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– Use a suitable tool -1- (e.g. ∅ 2 mm drill bit) to prevent turning.

1.15 Wheel electronics (TPM) - Beru system

View of Beru system
WARNING
After using tyre sealant, the wheel electronics on the affected wheel must be renewed.
WARNING
The wheel electronics must be renewed if damaged.
– Press wheel electronics -1- against base of rim.
– Working from behind valve, secure wheel electronics to valve
using micro-encapsulated bolt ⇒ Item 6 (page 17) .
Note
Tighten micro-encapsulated bolt to 4 Nm on all models.
Renew micro-encapsulated bolt.
Special tools and workshop equipment required
20 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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♦ Torque wrench -V.A.G 1410- and tool insert -V.A.G 1410/1-
Tightening torque for all models: 4 Nm
1.16 Wheel electronics (TPM) - Siemens sys‐ tem
WARNING
After using tyre sealant, the wheel electronics on the affected wheel must be renewed.
Wheels and tyres - Edition 02.2010
♦ A micro-encapsulated bolt is not used in conjunction with the
Siemens wheel electronics.
♦ A union nut ⇒ Item 7 (page 17) is used to hold the wheel elec‐
tronics in position in the rim.
♦ The metal valve body acts as an antenna.
♦ Connection between metal valve body and wheel electronics
must not be interrupted.
WARNING
When pressing wheel electronics against base of rim, counter­hold metal valve by hand from opposite side. Connection be‐ tween metal valve and wheel electronics must not be interrupted or broken. The wheel electronics must be renewed if damaged.
– Press wheel electronics against base of rim.
– Fit union nut to metal valve and tighten to secure wheel elec‐
tronics ⇒ page 18 .
1. Fitting wheels / tyres / tyre pressure monitor 21
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2 Tyre requirements and tyre mainte‐
nance

2.1 Introduction

The purpose of this revised information is to supplement your ex‐ isting knowledge and experience.
Our customers should always receive competent and plausible answers to their questions regarding “wheels and tyres”.
By providing this information we want to help you make reliable and safe assessments when dealing with tyre damage and rela‐ ted problems.
In this chapter you will learn more about tyres and wheels/rims.
Tyres are high-tech products that are especially adapted to the requirements of modern vehicles.
As with all highly developed technical products, tyres require proper care, maintenance and service. This is essential to ensure safety, performance and comfort for the entire service life of the tyre.
Tyres are constantly being further developed. Quality tyres are the result of modern design methods and production processes, as well as continuous quality checks. All tyres that are approved by Audi have been tested by the technical development depart‐ ment and have been designed specifically for each model in collaboration with the tyre manufacturers.
For this reason, we recommend only fitting tyres approved by Au‐ di and made by recommended manufacturers.
Vehicle safety is the top priority. An ideal safety compromise has to be achieved, taking into account the various conditions in which the tyres are used:
Different speed ranges
Winter and summer driving conditions
Wet and dry roads
etc.
Every tyre is subjected to a wide range of different driving condi‐ tions over its entire service life. It is therefore important that the basic requirements for ensuring optimum tyre performance are met.
Proper wheel alignment is very important for ensuring the maxi‐ mum service life of the tyre. The wheel alignment must always be within the specified tolerance range.
Note
Tyre damage and related problems can have various causes. It is therefore very important that you can determine whether the problem has been caused by the tyre or by other components.
The tyre properties change as a result of normal tyre wear. Rolling noises or rough running can be the result of such wear. These are simply the symptoms of normal wear and tear and do not consti‐ tute damage in the sense of the tyre being defective. You can take measures to eliminate the symptoms at least to some degree.
22 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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However, in some cases it may not be possible to eliminate tyre noise completely.

2.2 Requirements to be met by tyres

A - Wet braking properties
B - Driving comfort
C - Steering accuracy
D - Driving stability
E - Tyre weight
F - Life expectancy
G - Rolling resistance
H - Aquaplaning
The pie chart illustrates to what extent the tyre meets the various requirements. The tyre in this example (with its specific structure and rubber composition) would meet the requirements listed above (A to H) to the extent indicated by the size of the segments of the pie.
Improving performance in one segment would result in poorer performance in the other segments.
Example:
An improvement in wet braking properties -A- leads to a reduction in driving comfort -B-, rolling resistance -G- and life expectancy
-F-.
The life expectancy of a car tyre depends not only on the rubber composition and design of the tyre. The conditions of operation, the type of vehicle and the style of driving also have a significant influence on its mileage performance.
Modern vehicles enable comfortable and economic driving, but also a more "sporty" driving style. Mileage performance of the tyres can vary from approx. 5,000 to 40,000 kilometres or more.
Wheels and tyres - Edition 02.2010
Note
The driving style is the most important influencing factor as re‐ gards the service life of a tyre.

2.3 Factors influencing the service life of a tyre

The following factors influence the service life of a tyre to varying degrees.
♦ Speed
♦ Braking
♦ Acceleration
♦ Cornering
♦ Driving style
♦ Maintenance
♦ Tyre pressure
Environment:
♦ Road surface
2. Tyre requirements and tyre maintenance 23
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♦ Ambient temperature / climate
Vehicle:
♦ Weight
♦ Tyre pressure
♦ Dynamic toe and camber settings
Tyre use:
Speed range, wet or dry
Tyre type:
Winter/summer

2.4 Tyre pressure (maintenance)

The weight of the vehicle causes the tyre contact area to flatten. This in turn causes the running surface and the entire ply of the tyre to be continually deformed when a tyre is rolling. If the tyre is underinflated, the amount of flex is higher, resulting in a greater increase in heat and increased rolling resistance. This then leads to increased wear and poses a greater safety risk.
Example: Specified standard tyre pressure with cold tyres, ac‐ cording to vehicle load
Tyre pressure (bar) Tyre pressure (%) Tyre life (%)
2.3 100 100
1.9 80 85
1.4 60 60
1.0 40 25
If tyre pressure is too high, this will result in poor rolling comfort and increased wear across the centre of the tread. We recom‐ mend to always observe the tyre pressures specified by the manufacturer.
Diagram 1:
Tread depth versus tyre life for vehicles with front-wheel drive and V-rated tyres
P - Tread depth
S - Mileage covered
1 - Front axle
2 - Rear axle
24 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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Diagram 2:
Tread depth versus tyre life for vehicles with four-wheel drive and V-rated tyres
P - Tread depth
S - Mileage covered
1 - Front axle
2 - Rear axle
Note
The diagrams shown are not applicable in all cases.
They are merely intended to give an idea of the wear rates of tyres on the front and rear axles and with front-wheel drive and four-wheel drive.
The tyre service life may differ significantly, depending on op‐ erating conditions and running gear.
Diagrams -1- and -2- show that the tread on a new tyre wears faster than the tread on a heavily used tyre. As the wear curve is not linear, it is not possible to estimate the tyre service life on the basis of wear after the first 5,000 km.
On front-wheel drive vehicles, the front tyres not only have to transmit the steering and driving forces, but also the greater part of the lateral and braking forces. This causes the front tyres on front-wheel drive vehicles to wear much faster than the rear tyres. Even tyre wear can be achieved by rotating (interchanging) the front and rear tyres on a regular basis. Rotating wheels
⇒ page 33 .
Wheels and tyres - Edition 02.2010

2.5 Driving style

1. Constant driving speed, no deceleration or acceleration.
Example:
Speed (km/h) Wheel slip Wear
100 1 1 180 3 9
2. Braking
Most wear is caused during braking.
Example: Braking from a speed of 50 km/h.
Braking dis‐ tance (m)
Vehicle allowed to roll to a stop 0 0 100 0.1 g 4 1 50 0.2 g 8 4
12.5
4) g = gravitational acceleration: 9.81 m/s
5) A deceleration of 0.4 g corresponds to heavy braking.
3. Acceleration (driving style)
Slip caused when driving off gently is approximately the same as that caused when driving at a constant speed of 100 km/h.
Lateral acceleration
6)
in g
5)
0.4 g
2
Wheel slip Wear
32 2000-3000
2. Tyre requirements and tyre maintenance 25
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Example:
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Wheel slip Wear
Driving off gently 1-2 1 Driving off normally 7-8 5 Driving off with
20 or more 100-200
wheels spinning
Cornering (driving style)
A “sporty” driving style and driving at higher speeds also cause greater wear when driving through corners.
In practice, this means that wear is increased 16-fold when the cornering speed is doubled. This is the price that has to be paid for going faster.
Example: Driving through a corner with a radius of 150 m.
Speed (km/h) Lateral acceleration
in g
6)
Wear
50 1 = 0.13 g 1 80 2.5 = 0.33 g 6.5 100 4 = 0.53 g 16
6) g = gravitational acceleration: 9.81 m/s
2

2.6 Measuring tread depth

Note
The tread depth is measured in the main tread channels.
Do not measure at the TWIs (Tread Wear Indicators).
Measure the tread depth in the main tread channel, at the points where the tyre is worn most heavily. The main tread channels can be identified by the TWIs (tread wear indicators). The position of the TWI indicators is marked at various points on the sidewall of the tyre. The bars of the TWI have a height of 1.6 mm. This is the minimum tread depth required by German law.
Different values may apply in other countries.
The TWI indicators must not be included in the measurement. Tread depth should always be measured at the deepest point of the tread channel.
A - TWIs (tread wear indicators) in main tread channel. These indicators are marked at 6 points around the tyre sidewall.
B - -P- is the depth of the main tread channel
26 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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Tread wear indicator ­TWI
TWIs7) are marked at 6 points on the circumference of the side‐ wall.
7) TWI = tread wear indicator

2.7 Useful information regarding tyres

2.8 Identification markings on the tyre side‐ wall
Example: Dunlop SP Sport 9000
1 - Size: 215/55 ZR16
❑ Designations on PAX
tyres ⇒ page 28
2 - Manufacturer (trade name)
3 - Tread designation
4 - Code for tubeless tyres
5 - Radial-ply tyre construction (radially oriented fibres in car‐ cass)
6 - Notes for versions with “rim protection”
7 - Date of manufacture - see Tyre ageing
⇒ page 32
Wheels and tyres - Edition 02.2010
Note
8 - E number = Approval num‐ ber. Tyre complies with Euro‐ pean Directives/Regulations
❑ European Directives/
Regulations ECE-R30, EEC92/93 or ECE - R 117
Note
9 - Country of manufacture ­Made in Germany.
10 - Manufacturer's internal tread code
11 - Department of Transpor‐ tation - the tyre conforms to the U.S. Department of Transportation guidelines
12 - Example: Dunlop SP Sport 9000
DOT- Code ID number for manufacturer's plant, tyre size and tyre model
2. Tyre requirements and tyre maintenance 27
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13 - Maximum permissible load (load index) and maximum permissible inflation pressure
❑ Table ⇒ page 29
Note
14 - Number of plies in the centre of the tread and in the sidewalls and information about the material
15 - Position of TWIs (Tread Wear Indicators)
⇒ page 27 .
16 - Tread wear index - resistance to abrasion - based on US standard test
17 - Traction rating - evaluation of wet braking capacity A, B or C according to US test
18 - Temperature rating - evaluation of temperature rating A, B or C according to US test
19 - Safety notes for use or fitting of tyre
20 - Reference to ultra lightweight tyre construction, tyres are up to 30% lighter
21 - Specified direction of rotation for tyre
22 - Inmetro designation, required only for Brazil
Note
An additional designation required by Audi, e.g. “R01” may also appear on the sidewall. These designations appear on tyres ap‐ proved by Audi and specially matched to particular Audi models.
Note
Tyres which comply with EU Regulation ECE - R117 (new road noise limits for tyres) also carry the marking “S” (for Sound) on the sidewall.
For passenger car tyres with a cross sectional width of up to 185 mm: from October 1, 2009 onwards
For passenger car tyres with a cross sectional width of be‐ tween 185 mm and 215 mm: from October 1, 2010 onwards
For passenger car tyres with a cross sectional width of over 215 mm: from October 1, 2011 onwards
Self supporting tyres (SST) and PAX tyres with run-flat capability have a special marking on the tyre sidewall which differs accord‐ ing to manufacturer.

2.9 Designations on sidewall of tyres with run-flat system (PAX)

Summer tyres up to
240 km/ h
Winter tyres up to
160 km/
Winter tyres up to
h
190 km/ h
1 2 3 4 5 6 7
195 65 R 15 91 V
195 65 R 15 91 Q M+S
195 65 R 15 91 T M+S
28 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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Wheels and tyres - Edition 02.2010
High-speed tyres faster
1 2 3 4 5 6 7
225 50 ZR 16 19 Z than 240 km/h
1 - Tyre width
2 - Tyre height to width ratio in %
3 - Code for tyre type “R” indicates radial
4 - Rim diameter designation
5 - Load rating code
6 - Speed rating code
7 - Winter tyre/code for all-season tyre

2.10 Speed rating / maximum speed

Code on sidewall Maximum permissible speed
for tyre in km/h
L 120 M 130 N 140 P 150 Q 160 R 170 S 180 T 190 U 200 H 210 V 240 W 270 Y 300 ZR above 240

2.11 Load rating code/load index (LI)

The load rating can be found on the sidewall of the tyre. It provides information about the maximum load that the tyre can bear.
The load rating is included in the size designation of the tyre (e.g. 195 R 15 91 H). It is indicated on the tyre as a code according to ETRTO. The following table shows the load rating codes used at VW/Audi with the corresponding load capacity of the tyres.
Load rating code Maximum load of tyre in kg
76 400 77 412 78 425 79 437 80 450 81 462 82 475 83 487 84 500
2. Tyre requirements and tyre maintenance 29
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Load rating code Maximum load of tyre in kg
85 515 86 530 87 545 88 560 89 580 90 600 91 615 92 630 93 650 95 690 96 710 97 730 98 750 99 775 100 800 101 825 102 850 103 875 104 900 105 925 106 950 107 975 108 1000 109 1030 110 1060 111 1090 112 1120
30 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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2.12 The valve

1 - Valve body
2 - Valve core
3 - Valve cap
1. Valve body
The rubber valve for tubeless tyres is designed to be an air-tight seal on the hole in the rim. The elastic material of the rubber valve body presses tightly into the hole in the rim.
In the case of valves with a threaded metal base, a rubber seal is used to seal the rim. The lateral faces of the rim hole are sealing surfaces. They must therefore be free of rust and dirt and must not be damaged.
2. Valve core
The valve core fulfills the most important task in the valve; it acts as a seal and enables you to adjust the inflation pressure. The small flat seal on the valve core can only function correctly if it is free of foreign particles, dirt and moisture.
3. Valve cap
A valve cap must always be screwed onto the valve. It prevents dirt from getting into the valve. Dirt in the valve could reach the seal on the valve plunger when the tyre is inflated and lead to leakage.
The valve must be renewed every time a new tyre is fitted.
If the vehicle is driven without caps on the valves, there is the danger that dirt may get into the valve. This leads to a gradual loss of air, which in turn can lead to the destruction of the tyre
⇒ page 27 .
Wheels and tyres - Edition 02.2010
Note
Please note: The valve cap must be fitted tightly to ensure air­tight sealing.

2.13 Tyre storage

Storage area:
Rooms used for storing tyres must be
dark
dry,
cool,
well ventilated.
Stored tyres must not come in contact with fuel, oil, grease or chemicals under any circumstances. Otherwise, the material in the tyre will be damaged by chemical reactions which are not al‐ ways visible.
As a result, dangerous situations can occur when the car is driven. Of course, tyre damage occurs only if the tyre is in contact with the chemical for a relatively long time. If a few drops of petrol drip onto the tyre while you are filling the tank, this is of no concern.

2.14 Storing the tyres

Complete wheels
2. Tyre requirements and tyre maintenance 31
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Tyres mounted on wheels can be stored flat, stacked one upon the other. The inflation pressure should be increased to a maxi‐ mum of 3 bar.
Tyres without wheels
Tyres without wheels are best stored standing vertically. If tyres are stacked flat for a long period of time, they will be pressed together quite considerably. They will then be more difficult to fit, as the tyres do not sit on the bead seats. If tyres are stored stand‐ ing vertically, it is recommended to turn them every 14 days to avoid flat spots.

2.15 Tyre ageing

Tyres age as a result of physical and chemical processes where‐ by the function can be impaired. Tyres which are stored for long periods of time harden and become brittle faster than tyres which are constantly in use on a vehicle. Older tyres may develop hair‐ line cracks as a result of ageing. When tyres are in regular use, the constant flexing activates softeners in the rubber, preventing hardening and the development of cracks.
It is therefore important to not only take into account the tread depth, but also the age of spare tyres, stored tyres and tyres which are not permanently in use. The tyre age can be seen on the DOT designation, which includes the production date of the tyre.
Example of a DOT number:
DOT ...... 5 0 0 2 <
In this example, the production date is the 50th week of 2002 (the DOT number had 3 digits up to December 31, 1999).
Recommendation:
♦ We recommend that you only use tyres which are older than
6 years in emergencies and make sure you then drive with great caution.
♦ When new tyres are fitted, the spare tyre may also be used if
it is in perfect condition and not more than 6 years old. The age of the tyre has a great influence on the high-speed capa‐ bility of the tyre. It is possible to combine a spare tyre which is several years old with new tyres, however, this can have an adverse influence on car handling.
♦ Tyres are constantly being further developed, which can lead,
for example, to slight changes in the rubber compound, even if the tyres are of the same make, size and tread pattern.
♦ For reasons of safety, tyres of the same make and with the
same tread pattern should be mounted on one axle. All Audi and VW vehicles are factory-fitted with four identical tyres and wheels.
♦ Vehicles with four-wheel drive must always be equipped with
four wheels with tyres of the same size, construction, tread pattern and make.
Calendar week
Year of manufac‐
ture
Stands
for 2002

2.16 Renewing tyres

Tyres must always be renewed when:
the legal minimum tread depth of 1.6 mm is reached,
32 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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there is visible mechanical damage
the tyres are more than 6 years old.

2.17 Care and maintenance of alloy wheel rims

Regular care is required to maintain the decorative appearance of alloy wheels over a long period of time.
In particular road salt and dust from brake abrasion must be thor‐ oughly washed off every 2 weeks; otherwise the finish of the alloy wheel will suffer.
Suitable cleaning agents:
♦ Plain water or water with soft soap
♦ Water and essence of vinegar
♦ Alloy wheel cleansers without acids or strong solvents
Do not exceed the soaking time of the cleaning agent.
The shorter the recommended soaking time, the stronger and more aggressive the cleaning agent.
If the finish is damaged, for example by stones, the damage must be repaired as quickly as possible.
Removing adhesive residue from glued balance weights on alloy rims:
♦ Strong solvents and acids attack the finish on alloy wheels and
the surface of the wheel becomes matt and milky. These sub‐ stances should therefore not be used.
♦ To remove adhesive residue on alloy wheels, use alloy cleans‐
ers or a petrol-based cleanser. Do not exceed the soaking time of the cleaning agent.
♦ After cleaning or removing adhesive residue from wheels,
rinse them with water.
Rotating wheels:
♦ Vehicles with front-wheel drive exhibit more tread wear on the
front wheels due to the greater forces they have to transmit.
♦ In order for all 4 wheels on the vehicle to have the same serv‐
ice life, we recommend rotating the front and rear wheels/ tyres.
♦ Ensure that uni-directional tyres are not reversed.
♦ The longer the tyre runs at one position, the more it wears at
certain points. It is therefore advisable to rotate the wheels at short intervals, for example every 5,000 km.
♦ Diagonal rotation is possible only with non-directional tyres.
This wheel rotation method is especially advantageous in the case of saw-tooth wear. For more information on saw-tooth wear, refer to ⇒ page 40 .
Wheels and tyres - Edition 02.2010
♦ If saw-tooth wear has already progressed and the tread is
worn by more than 50%, only slight improvements would be achieved and rotation is not recommended. The elasticity of the tread blocks declines and the saw-tooth wear does not progress.

2.18 Tyres with rim protectors

The tyre industry produces tyres with rim protectors for light alloy wheels. The rim protectors are intended to protect the light alloy wheels against damage due to kerbing.
2. Tyre requirements and tyre maintenance 33
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A combination of a tyre with rim protector, a steel rim and a full­size wheel cover can lead to the loss of the wheel cover while the vehicle is in motion. The wheel cover becomes unseated due to the flexing of the tyre.
WARNING
When fitting tyres on steel rims, make sure not to use tyres which have rim protectors.
The illustration shows the inadmissible combination of steel rim, full-size wheel cover and a tyre with rim protector.
A - Rim protector
B - Flange of a steel rim
C - Full-size wheel cover
WARNING
This combination must not be fitted!
34 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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3 Tyre wear/ mileage

3.1 General notes

A tyre has to meet numerous requirements. Refer to items A to H in the list below.
Different types of tyres meet these requirements to varying de‐ grees.
Depending on the conditions in which the tyres are used and on the type of vehicle, some requirements will be more important than others.
H, V, and Z tyres for “high-performance vehicles” are expected to have good grip on wet and flooded roads. However, mileage per‐ formance cannot be as good for tyres of this type as it is, for example, in the case of S or T tyres.

3.2 Wear of high-speed tyres

These tyres are designed for very high speeds. When developing these tyres, good grip in wet conditions is the main objective. The rubber compositions required in order to meet this objective do not have the same wear resistance as T and H tyres for lower speeds.
The life expectancy of high-speed tyres is therefore considerably lower in comparable conditions of use.
Wheels and tyres - Edition 02.2010

3.3 Evenly worn tyres

The requirements to be met by tyres are increasing continuously.
This is caused by the following factors:
♦ increased vehicle weight
♦ high speeds
♦ high level of vehicle safety.
Greater loads on the tyre will, of course, lead to an increase in tyre wear.
Driving style has a critical effect on tyre wear. For this reason, customer claims regarding tyre wear on evenly worn tyres are not covered by the warranty.
The effective service life of a tyre can only be determined when the remaining tread depth has reached 2 mm (see diagrams
⇒ page 24 ).

3.4 One-sided wear

This is often caused by driving style, but can be the result of in‐ correct wheel alignment.
One-sided wear, usually in conjunction with signs of scuffing on the ribs of the tread and in the fine grooves, always occurs when the tyres have been allowed to roll with an extreme tyre slip angle, causing them to “rub” on the road surface.
Driving fast on a stretch of road with lots of bends will cause in‐ creased wear, in particular on the outer shoulder.
A rounded outer shoulder on the tyre in conjunction with a partic‐ ularly high degree of wear on the outer tread blocks indicates fast cornering. This wear pattern is influenced by driving style.
To optimise handling, the suspension is set to certain toe-in and camber values. Increased one-sided wear can be expected if
3. Tyre wear/ mileage 35
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tyres are allowed to roll under conditions which differ from those specified.
One-sided wear is especially likely if the toe-in and camber have not been set correctly. Moreover, there is a greater risk of diago‐ nal erosion.
Toe-out or negative toe-in:
Distance between front of wheels -A- is greater than distance be‐ tween rear of wheels -B- (-C- = direction of travel).
Toe-in or positive toe:
Distance between front of wheels -A- is less than distance be‐ tween rear of wheels -B- (-C- = direction of travel).
To prevent one-sided wear, care must be taken to ensure that the wheel is set within the tolerance specified by the vehicle manu‐ facturer. The most frequent deviation of the wheel alignment is caused by external influences, for example hard contact with the kerbstone when parking.
By measuring the axle geometry, you can check whether the wheel alignment is within the specified tolerances or whether it has to be corrected.

3.5 One-sided wear – adjustment error

If a customer complains about one-sided tyre wear, the axle ge‐ ometry should be checked. Warranty claims are only permissible if one-sided wear is caused by incorrect axle geometry that is not the result of external influences on the tyre and wheel. The wheel alignment protocol should be submitted together with the com‐ plaint report.
Increased, one-sided wear caused by the wheels running “off­track”. This frequently happens in conjunction with a rough tread surface or even the formation of “feathering” on the edges of the tread.

3.6 Wear in middle of tyre

This wear pattern is found on the driven wheels of high-perform‐ ance vehicles that are frequently driven long distances at high speeds.
At high speeds, centrifugal forces cause the tyre diameter to in‐ crease more in the middle of the running surface than it does at the shoulder. This causes drive forces to be transferred to the
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road surface from the central area of the running surface. This is reflected in the wear pattern.
Effects of this kind can be especially pronounced on wide tyres.
It is not possible to counter this wear pattern by reducing the tyre pressure.
DANGER!
For safety reasons, the tyre pressure must not under any cir‐ cumstances be reduced below the specified tyre pressure.
A more or less even tread wear pattern can be achieved by in‐ terchanging the tyres on the driven wheels and non-driven wheels in good time.
The typical tread wear pattern of tyres run on the driven wheels of a high-performance vehicle. The increased wear in the centre section of the tread results from the extra loading associated with centrifugal forces within the tyre and the transmission of drive forces.
Wheels and tyres - Edition 02.2010

3.7 Diagonal erosion

Diagonal erosion runs at an angle of approx. 45 ° to the direction of rotation. It usually occurs at one point only, but can also occur at several points around the circumference of the tyre.
Such erosion wear occurs almost exclusively on the tyres on the non-driven wheels, in particular at the rear left. Diagonal erosion occurs very often on some models, while it poses no problem at all on other models. The effect is intensified by high toe-in values. Toe-in values in the region of the lower tolerance limits of the specified alignment values improve the wear pattern.
The most pronounced diagonal erosion is often found in the area where the tyre components are joined.
Wheels with toe-in also roll with a tyre slip angle when the vehicle is driven in a straight line. This leads to diagonal strain in the con‐ tact area between the tyres and road surface.
This wear pattern is intensified when tyre pressure is too low. To avoid such tread wear patterns, the toe-in values of the two rear wheels should be identical and the specified tyre pressures ob‐ served.
3. Tyre wear/ mileage 37
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If you detect diagonal erosion, you should fit the wheels on the driven axle, assuming the wear is identified at an early stage. Deeper erosion cannot be repaired.

3.8 SA 18 - Wear; SA 11 - Adjustment error

In the event of a complaint of diagonal erosion, the toe-in setting should be checked. If toe-in is correct, the cause of the diagonal erosion is very probably the tyre itself. In this case, claims can be made under the warranty.
The wheel alignment protocol should be submitted together with the complaint report.
Tyres with diagonal erosion caused by incorrectly set axle geom‐ etry at the wheels are not covered by warranty.

3.9 Running gear modifications

If “suspension lowering kits” and/or alloy wheels that have not been approved by Audi are used as accessories, the wheel po‐ sitions can be altered so that the specified alignment is no longer maintained while driving.
Even if the axle geometry adjustment is correct with the vehicle stationary during wheel alignment, the changed vehicle height and wheel positions can cause the wheel suspension to move differently when driving.
Uneven wear is then unavoidable.
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4 Tyre noise

4.1 General notes on tyre noise

Tyre noise that can be heard by the human ear is caused by vi‐ brations which are transmitted by the air from the source of the sound to our ears.
Of interest here are the noises caused by certain characteristics and effects while the tyres are rolling (source of the sound).
The cause of the noise is largely dependent on the combination of the road surface and tyres.
The road surface structure and material will greatly affect tyre noise. For example, the noise level on a wet road is much higher than on a dry road.
The tread pattern on the tyre contact surface also has a significant influence on tyre noise. Tyres with transverse grooves at an angle of 90° generate more noise than tyres with grooves running di‐ agonally.
Small tread blocks are unstable. Their highly pronounced defor‐ mation agitates the air as the tyres roll. This creates the air vibrations that cause tyre noise.
Wider tyres are louder. They need more tread channels to dis‐ place water. When they are rolling, these tread channels displace the air, also creating air vibrations.
Further effects that also influence tyre noise:
♦ “Tyre vibration” is the principal cause of tyre noise. It is caused
by the columns of air in the tread channels being agitated.
♦ “Air pumping” is the compression and expansion of the air
caused by the deformation of the tread blocks as the tyre con‐ tact area moves along the road surface.
Wheels and tyres - Edition 02.2010

4.2 Useful information regarding tyre noise

Tyre noise is determined primarily by the tyres and the road sur‐ face.
As regards the road surface, it is the roughness, structure and material which influence tyre noise.
As regards the tyres, the width of the tyre and rim has an influence on tyre noise. Due to their larger contact area, wider tyres will cause more tyre noise than narrow tyres, as more air has to be displaced and more mass is agitated to create vibrations.
A wider wheel rim will also cause a tyre to have a wider contact area. The effect on tyre noise is thus very similar to that of a wider tyre. Moreover, the damping characteristics of the tyre may also be adversely affected by the wider wheel rim.
On vehicles with a front-mounted engine, tyre noise is more per‐ ceptible at the rear of the vehicle, as wind and engine noises are not as loud there.
4. Tyre noise 39
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Note
Tyres which comply with EU Regulation ECE - R117 (new road noise limits for tyres) also carry the marking “S” (for Sound) on the sidewall.
For passenger car tyres with a cross sectional width of up to 185 mm: from October 1, 2009 onwards
For passenger car tyres with a cross sectional width of be‐ tween 185 mm and 215 mm: from October 1, 2010 onwards
For passenger car tyres with a cross sectional width of over 215 mm: from October 1, 2011 onwards

4.3 Saw-tooth wear

Saw-tooth wear is a stepped wear pattern on the individual tread blocks – see illustration – that can cause increased tyre noise. The saw tooth pattern ("heel-and-toe" wear) is caused by uneven deformation of the tread blocks in the tyre contact area. Saw-tooth wear is more pronounced on non-driven wheels than on driven wheels.
New tyres are more susceptible to saw-tooth wear because of the greater elasticity of the high tread blocks. As the tread depth de‐ creases, the tread blocks become more rigid and the tendency to wear in a saw-tooth pattern decreases.
What does a saw tooth wear pattern look like?
Viewed in the direction of travel, the tread blocks are higher at the front than they are at the rear, see illustration. Pronounced saw­tooth wear can lead to customers complaining about tyre noise.
Pronounced saw-tooth wear occurs:
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♦ when toe-in values are too high
♦ when tyre pressures are incorrect
♦ when the tread is coarse, open
♦ on tyres which are fitted to the non-driven wheels
♦ when the vehicle is driven very fast around tight corners
1 - More pronounced wear at the front of the tread block
2 - Direction of rotation
Non-directional tyres:
In the event of saw-tooth wear, the direction of rotation of the tyre must be reversed. If saw-tooth wear is especially pronounced and tyre noise has increased, interchange the tyres diagonally. This will reduce the saw-tooth effect. On front-wheel-drive vehicles, this effect is intensified by the greater wear on the front axle. Tyre noise will be somewhat greater immediately after the tyres have been interchanged, but will return to the normal level after driving about 500 – 1,000 km.
Directional tyres:
In the event of increased saw-tooth wear on the rear tyres – in particular on front-wheel-drive vehicles – interchange the front and rear tyres. In the event of increased saw-tooth wear on the outer edges of the tyres on one axle, turn both tyres around on their rims. The left-hand wheel must then be fitted on the right side of the vehicle and the right-hand wheel on the left side.
Saw-tooth wear is a normal wear pattern and can be rectified on non-directional tyres by rotating the wheels diagonally. The wear should then be compensated after approx. 500 – 1,000 km.
The complaint report should include information detailing the pre‐ vious repair work.
Modern tyres are designed for maximum driving safety, even in wet conditions. This demands an open tread pattern at the shoulders of the tyre and a softer rubber composition for the tread itself, both of which accelerate saw-tooth wear.
Saw-tooth wear is a normal wear pattern and does not constitute a fault which is covered by the warranty.
Wheels and tyres - Edition 02.2010

4.4 Flat spots (brake-flatting)

Flat spots can result from an extreme brake application which causes the wheels to lock, so that the rubber is worn off at the contact patch between the tread and the road surface.
As the tyres slide over the road surface, friction generates heat, which also reduces the wear resistance of the tread material.
Not even a highly wear-resistant tread compound can prevent the flat spots caused by violent braking.
Even ABS-controlled brake systems are not always able to stop the wheels locking briefly, causing small patches of wear.
The degree of such wear depends largely on the vehicle speed, the road surface and the load placed on the wheel. The following examples should make this clear.
If a vehicle is braked to a standstill on a dry surface with the wheels locked, the amount of rubber worn from the tyre will cover an area the size of a postcard and will have a thickness of:
♦ up to 2.0 mm when braking from a speed of 57 km/h (23.8 m
braking distance)
4. Tyre noise 41
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♦ up to 3.3 mm when braking from a speed of 75 km/h (41.8 m
braking distance)
♦ up to 4.8 mm when braking from a speed of 92 km/h (71.6 m
braking distance)
Tyres with such damage must no longer be used and must be renewed.
Tyres with flat spots due to hard braking and those damaged due to other driving errors are not covered by warranty (SA 13 - Out of round or unbalanced; SA 20 Rolling noise).
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5 Rough running caused by wheels/
tyres

5.1 Causes of rough running

Rough running can have a number of different causes. It can also be caused by tyre wear.
Tyre wear caused by driving is not always evenly spread across the entire running surface of the tyre. This causes slight imbal‐ ances which affect the smooth running of a wheel which was previously exactly balanced.
Minor imbalances will not be felt at the steering wheel, but that does not mean that they are not there. They increase wear on the tyre and thus reduce the tyre service life.
Recommendation:
To ensure optimum safety, smooth running and even wear throughout the tyre's service life, we recommend having the wheels and tyres balanced at least twice during the service life of the tyre.
Rough running can also be caused by flat spots resulting from storage or handling ⇒ page 43 .
Wheels and tyres - Edition 02.2010

5.2 Flat spots caused by storage or handling

Flat spots caused by storage or handling can also cause rough running.
What is a flat spot?
It is important that flat spots on the tread are identified as such.
A flat spot in the tyre cannot be eliminated by re-balancing.
Flat spots of this kind can re-occur at any time due to particular circumstances. Flat spots caused by storage or handling can be eliminated without complicated special tools. This does not apply to flat spots which have been caused by hard braking,
⇒ page 41 Flat spots (brake-flatting).
Note
Flat spots caused by hard braking cannot be repaired. Such tyres must be renewed.
Other causes of flat spots:
♦ The vehicle has been left standing in one place without being
moved for a long period.
♦ The tyre inflation pressure is too low.
♦ The vehicle was placed in a paint shop drying booth after
painting.
♦ The vehicle was parked with warm tyres in a cool garage or
similar for a long period of time. In this case, a flat spot may even occur overnight.
Eliminating flat spots caused by storage or handling
♦ Flat spots caused by storage or handling cannot be eliminated
from the tyre using workshop equipment.

5. Rough running caused by wheels/tyres 43

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♦ Flat spots caused by storage or handling cannot be eliminated
by re-balancing.
♦ Check and, if necessary, correct inflation pressures.
♦ The flat spots can only be removed by running the tyres warm.
♦ We do not recommend running the tyres warm in cold and
wintry weather.
DANGER!
Do not endanger yourself or other road users during this road test.
Observe the highway code and speed limitations in force when performing the road test.
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6 Balancing wheels

6.1 General notes

Before you start balancing the wheels, the following requirements must be met.
The tyre pressure must be OK.
The tyre tread must not show one-sided wear and should be
at least 4 mm deep.
The tyre must not have a flat spot caused by storage or han‐
dling ⇒ page 43 .
A flat spot in the tyre cannot be eliminated by re-balancing.
The tyre must not show any signs of damage, for example
cuts, piercing, foreign bodies, etc.
The wheel suspension, steering and steering linkage, includ‐
ing the shock absorbers, must be in perfect condition.
You must have conducted a road test.
Wheels and tyres - Edition 02.2010

6.2 Conducting a road test before balancing wheels

If a customer brings a vehicle to the workshop complaining about “vibration”, a road test is essential prior to balancing the wheels.
♦ This will give you information about the nature of the rough
running.
♦ You will be able to determine in which speed range the rough
running occurs.
– Raise the vehicle on a lifting platform immediately after the
road test.
– Mark the positions of the tyres on the vehicle:
Note
Mark front left tyre “FL”, front right tyre “FR”, rear left tyre “RL” and rear right tyre “RR”.
– Remove the wheels from the vehicle.
Caution
On vehicles with ceramic brakes the wheel must not be allowed to drop onto the brake disc. This would cause irreparable dam‐ age to the disc. When removing or fitting a wheel, screw the long assembly pin into the top wheel bolt hole (12 o'clock po‐ sition) in place of the wheel bolt, and screw the short pin into one of the other holes to support the wheel. The wheel can then slide along the assembly pins when fitting or removing it.
– Balance the wheels.

6.3 Balancing wheels on stationary wheel balancing machine

– Attach the wheel to the wheel balancing machine.
6. Balancing wheels 45
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Dirt and rust in the area of the contact surfaces and centre of the wheel distort the result.
– Clean the contact surfaces, the centre of the wheel and the
recess on the inside of the wheel before mounting the wheel on the wheel balancer.
– Mount the wheel with tyre on the wheel balancer.
Use the wheel balancing machine centring system -VAS 5271- to centralise the wheel. This will ensure that the wheel is fully cen‐ tralised and clamped without damage. The wheel cannot be centralised 100% with conical clamping elements on the wheel balancing machine. A deviation of 0.1 mm from the centre results in an imbalance of 10 grams at the wheel/rim.
Use a model-specific clamping plate , e.g. -VAS 6243- , to clamp the wheel on the wheel balancing machine without damage.
This will yield better balancing results and protect the surface of the rim (for instance if it has a chrome design).
Note
When balancing tyres, please remember that cleanliness is ab‐ solutely essential, as indeed it is in the case of any other repair work you carry out. Only then can you attain a flawless result!

6.4 Work sequence when balancing wheels and tyres

– Rotate the wheel and tyre on the wheel balancer.
– Check that the indicator lines on the sidewall of the tyre near
the rim flange run evenly.
– Check that the body of the tyre runs evenly while the wheel
and tyre are rotating.
Note
If one-sided wear, flat spots from braking or severe erosion is ap‐ parent, balancing will not be able to achieve smooth running. In this case, the tyre must be renewed.
– Check the true running of the wheel and tyre. If the wheel and
tyre do not run true although there are no flat spots on the tyre, this may be due to radial or lateral run-out.
– Check the wheel and tyre for radial and lateral run-out
⇒ page 48 .
– If radial and lateral run-out are within the specified tolerance,
balance the wheel and tyre.
Note
The weight used per wheel should not exceed 60 grams.
If a larger weight is required, you can possibly achieve smooth‐ er running by "matching" the tyre and rim. Matching tyres
⇒ page 50 .
The wheel balancer display should indicate 0 grams.
– Bolt the wheel to the vehicle.
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Caution
On vehicles with ceramic brakes the wheel must not be allowed to drop onto the brake disc. This would cause irreparable dam‐ age to the disc. When removing or fitting a wheel, screw the long assembly pin into the top wheel bolt hole (12 o'clock po‐ sition) in place of the wheel bolt, and screw the short pin into one of the other holes to support the wheel. The wheel can then slide along the assembly pins when fitting or removing it.
– First hand-tighten the lowest wheel bolt to about 30 Nm.
– Then tighten the remaining wheel bolts to about 30 Nm (in
diagonal sequence). This process centres the wheel on the hub.
– Lower vehicle onto its wheels.
– Now use a torque wrench to tighten the wheel bolts to the
specified torque in diagonal sequence.
– Road-test vehicle.
Wheels and tyres - Edition 02.2010
Note
If you detect vibration during the road test, this may be due to tolerance in the wheel centring.
In unfavourable circumstances, the component tolerances of wheels and hubs could cumulate. This too can lead to vibra‐ tion. This vibration can be eliminated by using a finish balanc‐ er.

6.5 Finish balancer

Caution
Position vehicle on the sensor platforms (front wheels only on front-wheel drive vehicle, all four wheels on four-wheel drive vehicle) in order to balance the wheels.
Note
Before working with a finish balancer the mechanic needs to have been instructed by the manufacturer of the balancer.
If you determine a residual imbalance greater than 20 grams when balancing the wheels, you should rotate the mounting po‐ sition of the wheel on the hub.
– Mark the point at which the imbalance is indicated.
– Unbolt the wheel and rotate its position on the hub so that the
marking points downwards.
Note
Important! The hub must not rotate during this procedure.
– First hand-tighten the lowest wheel bolt to about 30 Nm.
6. Balancing wheels 47
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– Then tighten the remaining wheel bolts to about 30 Nm (in
diagonal sequence). This process makes sure the wheel is centred properly on the hub.
– Check that the imbalance is less than 20 grams using the finish
balancer.
Note
The imbalance should always be less than 20 grams before you change the balance weight.
– If necessary, remove the wheel bolts again.
– Rotate the wheel relative to the hub once more, turning it one
or two wheel bolt holes further.
– Tighten the wheel bolts using the method described above.
Note
Do not try to reduce the imbalance using balance weights until the imbalance is less than 20 grams.
– Balance the wheels until the imbalance is less than 5 grams.
– Tighten wheel bolts to specified torque setting if you have not
already done so.
– Always tighten wheel bolts to specified torque using a torque
wrench!

6.6 Vibration control system -VAS 6230 A-

The vibration control system -VAS 6230 A- has a range of addi‐ tional features over and above regular static wheel balancing.
One of the system's special features is the ability to test the radial force of wheels/tyres while they are rotating.
To do this, a roller is pressed against the wheel with a force of approx. 635 kg. This simulates the force exerted by the tyre's contact patch on the road surface while the vehicle is in motion.
The contact forces on the tyre vary due to variations in the stiff‐ ness of the tyre and the degree of radial and lateral run-out on the wheel/tyre.
The -VAS 6230 A- detects and memorises the position of maxi‐ mum measured radial force in the tyre. It then locates the smallest measurement between the wheel flange and the centre of the rim.

6.7 Radial and lateral run-out on wheels and tyres

Radial and lateral run-out occur when the wheel and tyre do not run absolutely true.
For technical reasons, 100% true running is not possible.
For this reason, the manufacturers of these components allow a precisely determined tolerance.
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If the tyre and wheel are mounted in an unfavourable position, this can lead to the maximum permissible tolerance for the wheel with the tyre being exceeded.
The table shows the maximum permissible tolerances for a wheel with mounted tyre.
Tolerances for radial and lateral run-out of disc wheel with tyre:
Disc wheel with tyre Radial run-out Lateral run-out
All versions 0.8 mm 0.9 mm

6.8 Checking radial and lateral run-out of wheels and tyres on V.A.G 1435

Checking lateral run-out:
– Preload dial gauge about 2 mm.
– Apply dial gauge to sidewall of the tyre as shown in illustration.
– Slowly rotate the wheel.
– Note the smallest and the largest dial readings.
Wheels and tyres - Edition 02.2010
Note
If the difference is greater than 1.3 mm, the lateral run-out is too great.
In this case, you can reduce lateral run-out by matching the tyre
⇒ page 50 .
You can disregard extreme readings on the dial gauge which are due to small irregularities in the rubber.
Checking radial run-out:
– Preload dial gauge about 2 mm.
– Apply dial gauge to running surface of the tyre as shown in
illustration.
– Slowly rotate the wheel.
– Note the smallest and the largest dial readings.
Note
If the difference is greater than 1 mm, the radial run-out is too great.
In this case, you can reduce radial run-out by matching the tyre
⇒ page 50 .

6.9 Checking radial and lateral run-out on wheel

– Mount the wheel on the wheel balancer.
– Use workshop equipment VAS 5271.
– Preload dial gauge about 2 mm.
– Slowly rotate the wheel.
6. Balancing wheels 49
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– Note the smallest and the largest dial readings.
S - Lateral run-out
H - Radial run-out
– Compare the measured values with the specifications in the
table.
Note
You can disregard extreme readings on the dial gauge which are due to small irregularities.
Specifications for radial and lateral run-out on wheel
Wheels Radial run-out Lateral run-out
Steel disc wheel 0.5 mm 0.5 mm Aluminium disc
wheel
0.3 mm 0.3 mm
Note
If the measured value exceeds the specification, acceptable smoothness cannot be attained.

6.10 Matching

When radial or lateral run-out of the wheel and tyre coincide, the out-of-true running of the wheel is amplified by the tyre.
For technical reasons, 100% true running is not possible when there is radial and lateral run-out on the wheel and tyre.
Under unfavourable circumstances, the radial or lateral run-out of the entire wheel with tyre may be greater than permitted.
The individual values of the wheel and the tyre may nevertheless each be within the permitted tolerances.
Turning the tyre strategically with respect to the wheel can parti‐ ally compensate for radial or lateral run-out.
This procedure, known as "matching", can be used to optimise the true-running properties of the wheel and tyre assembly.
Before matching the used wheels which are fitted on the vehicle the tyres must be run warm. This will eliminate any flat spots caused by storage or handling ⇒ page 43 .
Procedure for matching:
– Deflate the tyre.
– Press the tyre beads off the rim flanges.
– Coat the tyre bead all round with tyre fitting lubricant.
– Rotate the tyre 180° with respect to the wheel.
– Inflate the tyre to approx. 4 bar.
– Mount the wheel with tyre on the wheel balancer.
– Check true running/radial and lateral run-out.
50 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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Note
If the specified value for radial and lateral run-out is not ex‐ ceeded, the wheel can be balanced to 0 grams. For specified values, refer to page ⇒ page 50 .
If the radial and lateral run-out are not within the specified val‐ ues, the tyre must be rotated again.
– Deflate the tyre and press off the tyre beads from the rim
flanges.
– Rotate the tyre 90° with respect to the wheel (1/4 of a turn).
– Inflate the tyre to 4 bar again and check true running.
Note
If the specified value for radial and lateral run-out is not ex‐ ceeded, the wheel can be balanced to 0 grams.
If the radial and lateral run-out are not within the specified val‐ ues, the tyre must be rotated again.
Wheels and tyres - Edition 02.2010
– Press the tyre off the rim flanges again as described above.
– Rotate the tyre 180° with respect to the wheel (1/2 a turn).
If the radial and/or lateral run-out are still not within the specified values, check the wheel for radial and/or lateral run-out:
⇒ page 49 .
If the measured values for radial and lateral run-out of the wheel are within the specified values, the tyre has an impermissibly high radial or lateral run-out. In this case, the tyre must be renewed.
Note
After fitting the tyres there will be fitting lubricant between the tyres and the rim flanges.
For this reason, severe braking and acceleration manoeuvres must be avoided for the first 100 or 200 km driven. The tyres may otherwise rotate on the rims and your work will have been in vain.
6. Balancing wheels 51
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7 Vehicle pulls to one side

7.1 General notes

Perform a test drive to determine whether a vehicle is pulling to one side and if so, which side. If the vehicle pulls to one side, see procedure on ⇒ page 53 .
If wheel alignment is checked, include wheel alignment test re‐ sults in tyre complaint report.
General notes
Manufacturer's tolerances can lead to a slight amount of taper (asymmetry) in the tyre carcass. The rolling tyre then develops a lateral force which acts directly on the wheel suspension, leading to self-steering of the vehicle. Strategic rotation of the wheels can balance out this self-steering behaviour.
Taper (asymmetry)
Taper is caused by a slight offset in the tread area and/or the plies (amounting to a few tenths of a millimetre) in relation to the geo‐ metric centre of the tyre. Taper is not visible and cannot be measured with equipment available in the workshop.
1 ­Bead
2 - Shoulder
3 - Tread surface
4 - Steel plies
A - Geometrical centre of tyre
B - Actual centre of plies It can be offset to inside or outside.
52 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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Exaggerated for clarity.
1 - Plies and tread surface offset
The offset produces differences in stiffness at the inner and outer shoulders of the tyre, resulting in differing forces on the contact patch. Consequently the belt or tread will not be pressed onto the road surface with the same force (F1, F2). A slightly tapered over‐ all shape develops. The resulting force (conicity force Fk) can, depending on the speed, become so great that the vehicle then pulls to one side.
If the force Fk on one wheel of the axle is, for example, 50 Newton, and also 50 Newton on the other wheel, and both forces are ex‐ erted in the same direction, the forces are cumulated. Reversing a tyre on the rim can compensate for the lateral pull because the forces then act in opposite directions.
As the direction in which the conicity force acts is not visible, only road tests and strategic rotation of wheels and tyres will establish which tyre is causing the tendency to pull to one side.
The tyre consists of numerous components and materials which are vulcanised to form a single part at the end of a complicated manufacturing process. This results in differing production toler‐ ances which can cause more or less noticeable lateral forces (lateral forces resulting from the tapered shape). These forces can also occur in new tyres.
Pulling to one side on front axle:
Pulling to one side can be caused by the running gear. However, experience shows that in 90% of all complaints, the tyres cause pulling to one side.
Pulling to one side during normal driving:
On a straight, level road surface, the vehicle wants to pull to one side at a constant speed or with moderate acceleration. Force can be felt at the steering wheel.
Pulling to one side during fast acceleration:
Pulling to one side during fast acceleration is, in part, due to the basic design of vehicles with front wheel drive. Different friction levels at the left and right wheels or possible irregularities in the road surface (potholes) and consequently varying road adhesion have a substantial influence on the handling characteristics. This does not constitute a complaint which is covered by the warranty.
Wheels and tyres - Edition 02.2010

7.2 Remedies when vehicle pulls to one side

Test conditions before and during the test drive:
– Check all suspension components on the front and rear axles
for damage.
– Check tyre pressure and correct if necessary.
– Check the tyres for external damage: Punctures, cuts, blisters
on the sidewalls, flat spots from braking and or damage to the tread.
– Ask the customer if the tyre had been damaged by a nail or
similar object and was repaired by a tyre dealer. You may have to renew such tyres.
– Check tyres for even wear and tread depth.
– Are all tyres of the same type, manufacture and tread pattern?
– If the tyres are non-directional, ensure that all DOT classifica‐
tions on the tyre face outwards. The wheels and/or tyres on
7. Vehicle pulls to one side 53
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the vehicle have possibly already been changed around at an earlier date.
– Is the make of tyre approved by the factory as original equip‐
ment?
– Perform the road test on a road which is level, straight and
ungrooved and does not drop off to one side.
– Perform the test drive with the customer under the conditions
specified above. Ask the customer to demonstrate the prob‐ lem.
Note
There must be no cross wind during the road test.
If the complaint is justified, we recommend rotating the wheels and tyres as described below.
Before you begin, observe the following notes; otherwise your ef‐ forts may not have the desired effect.
♦ Mark the tyres and wheels before rotating them.
♦ After rotating wheels or reversing the tyre on its rim, you must
observe very carefully how the vehicle behaves during the road test. Note exactly what was changed.
♦ Assess the intensity of or a possible change in the tendency
to pull to one side.
♦ For this purpose it is important that the road tests are always
performed by the same person on the same road. It is best to drive the “test course” in both directions.
♦ Replacing a tyre with a new tyre does not guarantee that pull‐
ing to one side will be eliminated. See also ⇒ page 52 “Taper”. Therefore it is recommended to strategically change round the wheels as described below as a first step.
♦ If there are large differences in the tread depth of the tyres on
the front and rear axles, the tyres with the deeper tread should always be mounted on the front axle.

7.3 Strategic rotation of wheels for non-directional tyres

Perform a road test to determine if a vehicle pulls to one side and if so, which side.
If the vehicle pulls to one side, change around the front wheels.
Perform road test
Vehicle travels in a straight line - END
Vehicle now pulls to other side Vehicle still pulls to the same side
I I
Reverse one front tyre on its rim (direction of travel is
reversed).
I I
Perform road test Perform road test
Vehicle travels in a straight line - END Vehicle travels in a straight line - END
Vehicle does not travel in a straight line. Vehicle does not travel in a straight line.
I I
54 Rep. Gr.44 - Wheels, tyres, vehicle geometry
I
I
I
Change around tyres from front to rear.
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Wheels and tyres - Edition 02.2010
Change around the front and rear wheels Vehicle now pulls to other
side
I I I
Perform road test Reverse one front tyre on
Vehicle travels in a straight line - END
its rim (direction of travel is
reversed)
Vehicle does not travel in a straight line.
I
Change around front wheels. I
I I
Perform road test Perform road test
Vehicle travels in a straight
line - END
Vehicle does not travel in
a straight line.
Vehicle travels in a straight
line - END
I Vehicle does not travel in
a straight line.
Mount new tyres on front
axle
Mount new tyres on front
axle
I I
Perform road test Perform road test
Vehicle travels in a straight line - END Vehicle travels in a straight
line - END
I I
Vehicle does not travel in a straight line; consult Audi Product Support department.
No change
Check front and rear axle
geometry and adjust if
necessary. If adjustment is
OK, consult Product Sup‐
port department

7.4 Strategic rotation of wheels for unidirectional tyres

I
Perform a road test to determine if a vehicle pulls to one side and if so, which side.
I
Change around front and rear wheels with tyres.
I
Vehicle travels in a straight line - END
First renew one tyre on the front axle.
Vehicle travels in a straight line - END
Vehicle does not travel in a straight line.
Renew other tyre on the front axle.
Vehicle travels in a straight line - END
Vehicle does not travel in a straight line.
Check wheel alignment at front and rear.
Vehicle travels in a straight line - END
Perform road test
I
I
Perform road test
I
I
Perform road test
I
I
Perform road test
7. Vehicle pulls to one side 55
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Vehicle does not travel in a straight line; consult Product Support department.
56 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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8 Tyre damage

8.1 General notes

Note
As tyre damage can have serious consequences, you and the driver should regularly check the tyres to identify any problems at an early stage.
Damaged tyres cannot withstand driving conditions such as high speed, long distances, dynamic driving, etc.
Damage can have a number of causes:
♦ Driving with insufficient inflation pressure.
♦ Assembly error when fitting tyres on rims.
♦ Damage by embedded objects.
♦ Ageing.
♦ Improper storage.
Wheels and tyres - Edition 02.2010
Caution
Whenever a safety risk cannot be ruled out, the tyre must be renewed.

8.2 Checking tyres

When checking a tyre, look out especially for the following criteria:
♦ Surface erosion or ripples on the inner side (inflation pressure
was too low or not sufficient for the load)
♦ Loose rubber or loose radial threads
♦ Separated or deformed bead core
8. Tyre damage 57
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♦ Damage to tyre bead with cord ply visible

8.3 Construction of belted radial tyres

The illustration shows a cross section of a radial tyre.
1 - Tread block
2 - Tread groove
3 - Tread surface
4 - Nylon ply
5 - Belt layers, usually made of steel
6 - Bead core, consists of steel wires vulcanised into rubber. They ensure secure seating of the tyre on the rim.
7 - Bead filler
8 - Wheel flange protection protects the rim and tyre from abrasion from, for example, contact with the kerb. Tyres with Maximum Flange Shield (or rim protector bar) are marked with the abbreviation MFS.
The nylon ply -4-, belt layers -5-, bead cores -6- and bead filler
-7- form the carcass. The carcass is the “load-bearing structure” of the tyre.
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8.4 Torn tread

8.5 Radial depressions

Radial depressions are slight concavities in the tyre sidewall.
They run from the bead towards the shoulder of the tyre.
Radial depressions are caused by the accumulation of material at the joints of the tyre components.
Radial depressions do not influence:
♦ Safety,
♦ Service life,
♦ Running characteristics or other properties of the tyre.
Radial depressions are visible to varying extents. It is not neces‐ sary to inspect the tyre or remove it from the rim.
What causes radial depressions?
Modern steel belted radial tyres are constructed with single-ply sidewalls to save weight.
The sidewall components consist of long strips before they are joined together to form a tyre. They must overlap at the joints. Consequently, slight unevenness or ripples are created in the area of the overlapping parts. The overlaps are easier to see from the outside due to the single-ply construction.
Wheels and tyres - Edition 02.2010

8.6 Impact damage

A swelling in the sidewall of the tyre indicates that the substructure of the carcass has been damaged.
Typical causes for such damage include, for example, driving over kerbs at a sharp angle.
Pinching the tyre in this way can damage the carcass.
The substructure of the tyre is stretched so far that individual fi‐ bres in the carcass may be broken.
The extent of the damage depends on the speed of impact, the angle of impact, the inflation pressure, the axle load and the type of obstacle.
8. Tyre damage 59
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Kerb impact damage marks on tyre sidewall.
Note
Driving over kerbs should be avoided wherever possible.
If you cannot avoid driving over a kerb, you should do so very slowly and as square-on as possible.
Interior view of a tyre with a ruptured carcass.
Due to a severe impact, the carcass was pinched on the wheel flange and is ruptured in the contact area.
Double rupture caused by pinching when driving over a kerb. Of‐ ten not detectable from outside.

8.7 Cuts

Cut caused by a sharp-edged object.

8.8 Damage caused by foreign bodies

Driving over hard, pointed objects like nails, screws and the like can pierce the tyre.
This always leads to tyre damage.
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Often, the object is so securely embedded in the tyre that it will not free itself even at higher speeds. It can then act as a plug and seal the tyre relatively well. This results in a gradual loss of pres‐ sure, which the driver will not notice immediately, but which can lead to sudden and complete tyre failure.

8.9 Loss of air from tyre

If the customer complains of a loss of air from a tyre, it is essential that you check for embedded foreign bodies.
Note
No repair should be attempted on steel-belted tyres if their struc‐ ture has been punctured by a foreign body.
Corrosion can develop on the steel wires. This will always lead to the separation of the rubber from the steel belt.
Generally, one cannot determine when the foreign body was em‐ bedded. The tyre structure may already have been damaged as a result of driving with insufficient tyre pressure.
Damaged belt wires will sooner or later lead to separation of the rubber from the steel belt. As a result, at some point, the tyre can fail completely, long after the tyre was first damaged.
Tyre damage caused by foreign bodies is not covered by the war‐ ranty.
Wheels and tyres - Edition 02.2010

8.10 Damage occurring when fitting tyres

Bead core broken during tyre inflation.
8. Tyre damage 61
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Modern radial ply tyres for passenger cars are mounted only on safety rims. Safety rims have a hump -1- running along the bead seat.
1 - Hump (H2)
2 - Inner bead seat
3 - Rim
4 - Wheel
5 - Outer bead seat
The hump prevents the tyre from being pressed out of the bead seat when travelling with insufficient tyre pressure.
When the tyre is inflated, the bead of the tyre may not slip com‐ pletely over the outer rim hump.
In this case, there is a danger of the bead core becoming over‐ stretched if the tyre pressure is too high. The steel wires would then rupture partially or completely. A broken bead core cannot be detected from the outside.
DANGER!
♦ Tyres with damaged bead cores are not seated safely and
securely on the rim. Such tyres are a safety risk!
♦ In addition, there is a risk of the partly broken bead core
breaking apart during continued operation and the tyre could suddenly tear open. If the bead core breaks during inflation, the carcass will also be destroyed.

8.11 Bead damage caused by fitting machine

The following errors which can be made when fitting tyres can lead to severe tyre damage:
♦ When rolling the upper bead on the tyre fitting machine, the
♦ The fitting head was not adjusted correctly.
♦ The edge of the fitting roller rolls onto the bead.
♦ The guide rollers are worn or have sharp edges.
It is often possible to identify the tracks of the guide roller as it was applied or ran off where the damage occurred.
Both tyre beads as well as the bead seats must always be coated with assembly paste.
opposite tyre bead is not seated completely in the rim well.
Note
If fitting damage remains undetected, there is a danger that the tyre will fail later during operation.
THEREFORE PLEASE NOTE:
Never fit a tyre without using assembly paste.
Do not allow the bead seating pressure to exceed 3 bar.
Do not allow the tyre inflation pressure to exceed 4 bar.
When the tyre has been fitted, reduce the tyre pressure to the specified value.
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8.12 Tyre pressure

The tyre pressure must be checked regularly. We recommend checking the tyre pressure every two weeks. The correct tyre pressure is especially important on long trips or when carrying a heavy load. A dynamic driving style also requires correct or even slightly increased tyre pressure.

8.13 Tyre damage due to insufficient inflation pressure

The most common causes for tyre failure is minor external dam‐ age, a defective valve or a leaking rim due to corrosion or dam‐ age.
Excessive heat due to driving with very low tyre pressure led to overheating and subsequent separation of the carcass from the rubber material.
The tyre shown here was sporadically driven with an inflation pressure which was insufficient for the load. A typical indication for this is the scuffing all round the bead caused by the wheel flange and also the discolouration. Small, furrowed creases are visible along the inside of the sidewall.
When the tyre rolls, strong shear forces develop between the steel belt layers, especially at the ends of the belts.
Wheels and tyres - Edition 02.2010
Wide furrows close to the bead all round the the tyre indicate that the tyre was driven with insufficient pressure.
Driving a vehicle with insufficient tyre pressure or ignoring or not recognising tyre damage can have serious consequences.
The tyre can no longer withstand the forces which develop when the vehicle is driven.
The function of the tyre is severely restricted by the defects men‐ tioned above. The rubber compounds separate, which results in the partial separation of tyre components or even its complete destruction.
Such damage usually develops over a long period of time. If an already damaged tyre is exposed to high stress, the centrifugal forces which occur at high speeds can tear components off the tyre.

8.14 Slow loss of tyre pressure

Slow loss of tyre pressure is particularly problematic, because even experienced drivers are often not aware of it happening.
Insufficient tyre pressure and the subsequently increased amount of flexing (internal friction) causes the tyre material to heat up considerably and may lead to the separation of the various com‐ ponents and rubber compounds.
8. Tyre damage 63
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In the end, the tyre is usually destroyed completely.
The cause for the slow pressure loss cannot always be deter‐ mined because the tyre is severely damaged and structural com‐ ponents of the tyre are missing.
The following illustrations show tyres which were destroyed by driving with insufficient inflation pressure.
8.15 Temperature increase caused by insuf‐ ficient inflation pressure
The graph shows the temperature changes for a tyre in operation at a speed of 180 km/h.
A - Normal range. When the specified tyre pressure is adhered to, the temperature will remain stable.
B - Danger zone. When tyre pressure is 0.3 bar below specifica‐ tion, the temperature rises to above 120° C at high speeds.
C - Critical temperature threshold. A tyre defect will develop.
T - Temperature
t - Travel time in minutes

8.16 Tears in tyre

Use for tears in tyre, lost patches of tread or burst tyres.
Damage caused by external forces is not covered by the warran‐ ty.
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9 Vehicles with breakdown set

Audi vehicles are equipped with either a spare wheel or a break‐ down set, depending on the the vehicle specification.
The breakdown set is stowed in the luggage compartment in place of the spare wheel. It consists of a compressor and a bottle of tyre sealant.

9.1 Tyre sealant

WARNING
Wheels and tyres - Edition 02.2010
After using tyre sealant, the wheel electronics on the affected wheel must be renewed.
The tyre sealant in the bottle can only be kept for a limited period of time.
The expiry date -arrow- is specified on the bottle.
In the example shown, the expiry date on the bottle is 05/2003. The bottle must be renewed by that date.
The bottle must also be renewed any time it is opened, e.g. after a puncture.

9.2 Removing a tyre from the rim

Before removing a tyre filled or sealed with tyre sealant, you must drain the sealant from the tyre.
WARNING
♦ Avoid eye and skin contact with the tyre sealant.
♦ It can cause injury, irritation to eyes and allergies.
♦ Wear protective gloves and goggles when carrying out in‐
stallation or repair work.
– Place the wheel on a flat surface.
– Unscrew the valve core from the tyre valve.
9. Vehicles with breakdown set 65
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– Carefully make a hole in the shoulder area of the tyre using a
suitable drill or cutting tool.
– Hold the wheel over a drip tray and let the sealant drain off.
– Remove the tyre from the wheel rim.
– Clean the wheel, e.g. with a wet cloth.

9.3 Disposal of sealant

Any tyre sealant remaining in the bottle and full bottles whose expiry date has lapsed must be discarded.
Old or residual tyre sealant must not be mixed and discarded with other liquids. Adhere to the disposal guidelines in ⇒ Service Or‐ ganisation Handbook; Environmental protection and Waste dis‐ posal .

9.4 Fitting a new tyre

WARNING
After using tyre sealant, the wheel electronics on the affected wheel must be renewed.
Make sure to clean the wheel beforehand.
– The wheel electronics must be renewed if tyre sealant has
been applied, as liquid deposits on the pressure sensor could lead to incorrect displays.
– Fit a new tyre valve.
– Unscrew the valve core.
– Inflate the tyre to approx. 3 to 4 bar; you should hear the bead
of the tyre slip over the rim hump.
– Screw in the valve core.
– Adjust the tyre pressure in line with the specifications.
– Balance the wheel.
66 Rep. Gr.44 - Wheels, tyres, vehicle geometry
Page 73
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Wheels and tyres - Edition 02.2010

10 Tyre pressure monitoring systems

Exploded view of tyre pressure monitor ⇒ page 15
Wheel electronics (Beru system) ⇒ page 20
Wheel electronics (Siemens system) ⇒ page 21
Direct measuring systems according to vehicle type ⇒ page 18
Indirect measuring systems according to vehicle type ⇒ page 18
Note
The marking on the wheel electronics indicates which system is installed.
WARNING
Run-flat-tyres (PAX, SST) are always installed in conjunction with a tyre pressure monitoring system.

10.1 Tyre pressure monitoring system with pressure sensor

WARNING
After using tyre sealant, the wheel electronics on the affected wheel must be renewed.
The wheel electronics consist of a pressure sensor incorporated within the valve.
Two different versions of wheel electronics are currently used:
Beru tyre pressure monitoring system ⇒ page 20
Siemens tyre pressure monitoring system ⇒ page 21
View of Beru system
The pressure sensor transmits the recorded signals to the aerial of the tyre pressure monitoring system.
The pressure sensor is secured to the wheel via a bolt connection.
The tyre pressure monitor display in the dash panel insert warns the driver if the pressure sensor detects a drop in tyre pressure.
10. Tyre pressure monitoring systems 67
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Tyre pressure monitoring system
This system informs the driver of the current tyre pressures by sending the registered pressure values to the instrument cluster display via a control unit.
Note
If vehicles with TPM sensors are transported by air freight, the airline must be notified about the TPM sensors.
The correct version must be used otherwise the tyre pressure monitoring system will not operate correctly.
For more information about this system, please refer to SSP 219 “Tyre Pressure Monitoring System”.

10.2 Tyre pressure monitoring with wheel speed sensor

Note
If the tyre pressure monitoring system uses a wheel speed sen‐ sor, wheel electronics are not fitted in the rim.
If the air pressure in a tyre drops, the speed of the wheel changes.
The speed sensor registers the altered wheel speed.
A display in the dash panel insert informs the driver about the tyre pressure change.
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11 Temporary spare wheels

11.1 Notes on the use of temporary spare wheels

Notify your customers of the following information whenever nec‐ essary, and refer them to the Owner's Manual.
The information given below also applies to spare wheels which have a yellow sticker specifying “MAX 80 km/h” or “MAX 50 mph”.
Note
The spare wheel/temporary spare wheel is designed to be used only for a brief period. It should therefore be replaced with the normal wheel as soon as possible.
The tyre pressure should be checked as soon as possible after fitting the spare wheel/temporary spare wheel. Refer to the tyre pressure specifications on the vehicle or to the Mainte‐ nance manual for the correct tyre pressures.
Do not exceed the maximum speed stated on the spare wheel (“MAX 80 km/h” or “MAX 50 mph”).
Avoid full acceleration, heavy braking and fast cornering.
Never drive the vehicle with more than one spare wheel/tem‐ porary spare wheel.
It is not permitted to use snow chains on the spare wheel for technical reasons.
If you need to use snow chains, you should therefore fit the spare wheel on the rear axle if the puncture occurred on a front tyre. The good wheel removed from the rear axle should then be fitted in place of the punctured front wheel.
Wheels and tyres - Edition 02.2010
11. Temporary spare wheels 69
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12 Tyres with run-flat capability (PAX)

Work on PAX wheels must only be performed by trained work‐ shops.
These workshops have suitably trained personnel and the nec‐ essary special tools.
12.1 Construction of tyres with run-flat capa‐ bility (PAX)
Run-flat tyres (PAX) are specially developed tyres that differ from conventional tyres as follows:
PAX tyre with support ring
– -I- PAX tyre with air
– -II- PAX tyre without air
– The tyre is anchored on a special rim which prevents the tyre
from sliding off when air is lost. The support ring is made of rubber and maintains stability in the event of a pressure drop.
♦ The inner and outer bead diameters differ in size. This makes
it possible to add a support ring inside the tyre.
♦ The tyre is secured differently to the rim.
♦ This allows the tyre height to be greatly reduced. This was
made possible by the reduced bead area due the special con‐ nection between the tyre and rim.
♦ The tyre beads are formed such that they engage in the rim
seat. Therefore, the tyre remains firmly secured to the wheel/ rim even when there has been a loss of inflation pressure.
Construction of the bead area for a standard tyre
1 - Wheel flange
2 - Inner plies
3 - Bead core
70 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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Construction of bead zone on tyres with run-flat capability (PAX)
1 - Loop
2 - Inner plies
3 - Bead core
4 - Wheel flange
Seating of tyres with run-flat capability (PAX)
Due to the construction of the tyre, it remains firmly attached to the wheel in all driving situations.
A wedged-shaped component of the tyre is thereby pressed be‐ tween the bead core and rim by the load. This occurs regardless of the tyre pressure.
Wheels and tyres - Edition 02.2010
Dimensions of tyres with run-flat capability (PAX)
As compared to standard tyres, run-flat tyres (PAX) have different dimensions and designations.
Run-flat tyres (PAX) can therefore only be fitted to special wheels designed for the PAX system.
1 - Width in millimetres: tyre width from sidewall to sidewall on
the standard rim (corresponds to the width dimension on standard tyres)
2 - Outer diameter in millimetres: maximum diameter of the new
tyre
3 - Nominal diameter in millimetres on standardised rim seat
4 - Small bead diameter in millimetres: outer rim seat
5 - Larger bead diameter in millimetres: inner rim seat
12. Tyres with run-flat capability (PAX) 71
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12.2 Codes and designations on tyres with run-flat capability (PAX)

As compared to standard tyres, run-flat tyres (PAX) have different codes and designations on the sidewall. This makes it easy to identify run-flat tyres.
Codes and designations on tyres with run-flat capability (PAX)
245 - Tyre width in millimetres
690 - Tyre diameter (outer) in millimetres
R - Radial construction
500 - Nominal diameter of standardised rim seat
A - Construction type index for the wheels with run-flat capability (PAX); “A” stands for asymmetric, since the two rim seats have different diameters.
99 - Maximum permissible load of tyre (99 = 1550 kg)
Y - Speed code (“Y” stands for a permissible top speed of 300 km/h).

12.3 Support ring on PAX wheels

Dimensions
Overview of important dimensions:
Codes/designations
Example: 90-500(35) CLI A 1 876107
90 - Nominal width in millimetres
500 - Nominal diameter in millimetres
35 - Height in millimetres
CLI - Support ring versions: CLI = clip support ring / FL = standard support ring
A - Construction type index, asymmetrical. Indication of tyre with run-flat capability (PAX)
1 - Support ring version
876107 - CAI, international article code
72 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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12.4 Dimensions and designations for PAX rims

Example: 235 x 500 A - 5 - 41
235 - Nominal width in millimetres
x - Single-unit
500 - Nominal diameter of standardised rim seat in millimetres
A - Asymmetrical
5 - Number of wheel bolt holes
41 - Rim offset in millimetres

12.5 Inflating tyres on PAX wheels

Wheels and tyres - Edition 02.2010
Observe the following important points when inflating the tyre:
– Only inflate after fitting the tyre with valve core installed. Check
whether the beads have properly seated at 1 bar.
– If one of the beads is not seated properly, do not let air out of
the tyre, but apply the fitting roller to the appropriate bead and press on lightly while turning. The bead will then seat itself properly.
– Then fill up with air until the specified inflation pressure for the
vehicle is reached. Tyre gas for standard tyres can also be used.
Note
Do NOT overfill tyre (e.g. up to 3.5 bar), even briefly, as is per‐ missible with standard tyres.

12.6 Wheel alignment

The procedure for adjusting the wheel alignment on vehicles with run-flat tyres (PAX) is the same as for vehicles with standard tyres.
Generally, the same measuring heads and fasteners for standard tyres with rim protector can be used on PAX wheels. (Fit to the inner side, secure to tyre tread).
12. Tyres with run-flat capability (PAX) 73
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12.7 Repairing tyres with run-flat capability (PAX)

General information
It is not always necessary to renew a tyre after it has lost pressure and then been run in an uninflated condition.
Note
The affected tyre should be removed and checked for damage by qualified personnel. Fitting of tyres and checking tyres for damage must only be carried out by qualified personnel.
After a run-flat tyre (PAX) has lost inflation pressure, check the tyre as follows:
– First remove as much gel residue from the tyre as possible.
Use the flat side of the putty knife to do so.
– Then clean away any remaining gel residue from the tyre and
support ring using water and a cloth.
– After separating the tyre and support ring, check both compo‐
nents (PAX) according to the following criteria.
Notes:
– When re-installing, make sure the support ring is the correct
size for the tyre and wheel dimensions.
– As with standard tyre/wheel systems, the PAX wheel must al‐
so be checked before fitting.
– Damaged wheels must be renewed.

12.8 PAX tyres - assessing condition

When checking a tyre, look out especially for the following criteria:
♦ Surface erosion or ripples on the inner side (inflation pressure
was too low or not sufficient for the load)
♦ Loose rubber or loose radial threads
♦ Separated or deformed bead core
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♦ Damage to tyre bead with cord ply visible

12.9 Checking support ring

As with tyres, the support ring does not always need to be re‐ newed after driving with a flat tyre.
Renew the support ring if the following damage is discovered:
♦ Broken parts or missing sections
Wheels and tyres - Edition 02.2010
♦ Tears in the running surface/separating walls
♦ Punctures and holes
12. Tyres with run-flat capability (PAX) 75
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♦ Blistering and discolouration due to overheating
Repairs on tyres
Note
Run-flat tyres (PAX) must not be repaired using a tyre patch or similar.
Flat tyre sprays/foams must not be used with PAX tyres, as these products are not compatible with the gel in the tyre.
76 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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13 Self supporting tyres (SST) with run-
flat capability
Removing and fitting run-flat tyres ⇒ page 10
Note
SST tyres may only be fitted to vehicles which have a tyre pressure monitoring system. The system warns the driver if the tyre pressure drops below a specified level.
Tyre damage and the resulting loss of pressure are not readily visible.
In the event of a total loss of pressure, it is possible to continue driving for up to 50 km at a maximum of 80 km/h.
Note the special installation instructions for SST tyres.
It is not permitted to fit both SST tyres and standard tyres on the same vehicle, even on separate axles. A standard tyre can be fitted only in exceptional circumstances for a brief period and limi‐ ted distance. The driver must be expressly informed that the SST run-flat characteristics do not apply in this case.
In the event of a puncture, it is the responsibility of the driver to check the affected tyre or tyres and decide whether it is possible to continue driving. See ⇒ Owner's Manual .
Use only the approved type of wheels for retrofitting (EH2 exten‐ ded hump rim contour).
Wheels and tyres - Edition 02.2010

13. Self supporting tyres (SST) with run-flat capability 77

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13.1 Design of an SST tyre

Removing and fitting run-flat tyres ⇒ page 10
If run-flat tyres are used, a tyre pressure monitor display must be fitted.
Tyre damage and the resulting loss of pressure are not readily visible.
SST tyres are labelled on the sidewall with a special RSC symbol (= Runflat System Component).
The markings on the sidewall of a run-flat tyre may differ accord‐ ing to manufacturer.
A self supporting tyre has run-flat properties in the event of a pressure loss. In the event of a puncture, the vehicle can be driven to the nearest workshop subject to certain restrictions (see ⇒ Owner's Manual .
Benefits
SST tyres can be driven for 50 km at up to 80 km/h even after a complete loss of pressure.
Driving style, vehicle speed, road surface, weather conditions, tyre condition and tyre load all affect the distance that can be driven with a puncture.
With an SST tyre, it is not necessary to change the wheel imme‐ diately even with the tyre completely deflated (i.e. you don't need to stop the vehicle in a dangerous place or in conditions of poor visibility).
The braking, steering and driving response are virtually unim‐ paired even with the tyre completely deflated.
You no longer need a spare wheel if SST tyres are fitted. From the customer's point of view, the benefits are savings in space and a lighter vehicle.
Technology in detail
Standard tyres without run-flat properties
– -I- Normal tyre with air
– -II- Normal tyre without air
– If the normal tyre loses air, the rim presses heavily against the
sidewall. The rubber becomes very hot and deteriorates quick‐ ly when rolling flat.
SST tyre with reinforced sidewall
SST technology is based on self-supporting reinforced sidewalls.
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– -I- SST tyre with air
– -II- SST tyre without air
– Particularly thick sidewalls -A- support the airless tyre on a
standard rim and the vehicle remains manoeuvrable. A special rubber compound strengthens the tyre and bears the weight of the vehicle in the event of a puncture.
The sidewalls on the SST tyre are reinforced to prevent pinching of the tyre between the road and the wheel rim in the event of a puncture.
Differences between H2 and EH2 extended hump rim designs
♦ EH2 - the extended hump prevents unseating of the SST tyre
after a loss of pressure.
♦ The hump on an EH2 extended hump rim is steeper and near‐
er the centre of the wheel.
WARNING
The clearance from the brake is reduced.
Wheels and tyres - Edition 02.2010

13.2 Servicing tyres with run-flat capability

General information
WARNING
♦ Run-flat tyres must be renewed after a puncture.
♦ Note the special installation instructions.
– As with standard tyre/wheel systems, the wheel must also be
checked before fitting.
– After a puncture, the wheel should be checked for damage
(excessive lateral and radial runout or other damage), as the wheel may have been damaged if it hit a pothole while the tyre was flat.
– Damaged wheels must be renewed.
Note
Flat tyre sprays/foams can be used with SST tyres.
Tyres must be renewed after a puncture.
Note the manufacturer's instructions.

13.3 Renewing tyres/conditions for use of run-flat tyres

Since a loss of pressure on run-flat tyres cannot always be de‐ tected by the naked eye, these tyres must only be used on vehicles with a tyre pressure monitoring system. The system warns the driver if the tyre pressure drops below a specified level.
Permissible:
♦ Direct measuring systems
♦ Indirect measuring systems
13. Self supporting tyres (SST) with run-flat capability 79
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Run-flat tyres must only be fitted on wheels with extended hump (EH2).
Note the special installation instructions.
It is not permitted to fit both run-flat tyres and standard tyres on the same vehicle, even on separate axles.
A standard tyre can be fitted only in exceptional circumstances for a brief period and limited distance. The driver must be ex‐ pressly informed that the run-flat characteristics do not apply in this case.
80 Rep. Gr.44 - Wheels, tyres, vehicle geometry
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