Shimano RD-TX30 - TECHNICAL,RD-TX50 - TECHNICAL,RD-TX70 - TECHNICAL,RD-TX70,RD-TX50,RD-TX30 Service Instructions Manual

Technical Service Instructions

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One Holland, Irvine, California 92618, U.S.A. Phone: [phone]

Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: [phone]

3-77 Oimatsu-cho, Sakai, Osaka 590-8577, Japan

Rear derailleur

Adjustment Method

RD-TX70/RD-TX50/RD-TX30

SI-5V80A

1. Top adjustment

Turn the top adjustment screw to adjust so
that the guide pulley is below the outer line
of the smallest sprocket when looking from
the rear.

Guide pulley

Outer line of smallest
sprocket

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2

Top
adjustment

1 2

screw

Installation of the rear derailleur

5 mm Allen Key

Tightening torque:

8 - 10 N·m {70 - 86 in. lbs.}

Push in and

tighten

Chain length

Add 2 links (with the chain on both the largest
sprocket and the largest chainring)

Chain

Largest

sprocket

Large

chainring

Cable securing and stroke adjustment

Place the outer casing so that it does not touch the basket and mudguard, otherwise it
may cause a problem with the performance of the derailleur.

Set the outer casing (RD-TX70/RD-TX50) so that its length is as follows.

• If routing the casing upward:

(The chain should be on the largest chainring and on the
largest sprocket.)
Add 10 mm to the length of the outer casing from the end
that is inserted into the outer casing holder to the end
which is inserted into the link.

Chain position

Largest

sprocket

Largest

chainring

Link

Outer casing holder

max.
angle

2. Connection and securing of cable

Connect the cable to the rear derailleur and, after taking up the initial slack in the
cable, reattach to the rear derailleur as shown in the illustration.
Secure the cable by pulling it with pliers with a force of 5 - 10 kg.

Tightening torque:

5 - 7 N·m {44 - 60 in. lbs.}

Pull

Note: Be sure that the cable is

securely in the groove.

Groove

3. Low adjustment

Turn the low adjustment screw so that the
guide pulley moves to a position directly
below the

largest sprocket.

Largest
sprocket

Guide pulley

4. How to use the B-tension adjustment screw

Mount the chain on the smallest chainring
and the largest sprocket, and turn the crank
arm backward. Then turn the B-tension
adjustment screw to adjust the guide pulley
as close to the sprocket as possible but not
so close that it touches. Next, set the chain
to the smallest sprocket and repeat the
above to make sure that the pulley does not
touch the sprocket.

Largest sprocket Smallest sprocket

Low adjustment
screw

B-tension

ajustment screw

• If routing the casing downward:

(The chain should be on the largest chainring and on the largest sprocket.)
Set the length of the outer casing so that it describes a smooth arc, and so that the
link stops in a position where there is a small gap between the link and the link stop.

Link

Chain position

Largest

sprocket

Connect the inner cable to the derailleur as shown in the
illustration.

This service instruction explains how to use and maintain the Shimano bicycle parts
which have been used on your new bicycle.
For any questions regarding your bicycle or other matters which are not related to
Shimano parts, please contact the place of purchase or the bicycle manufacturer.

Please note: specifications are subject to change for improvement without notice. (English)

© Apr. 2003 by Shimano Inc. XBC SZK Printed in Singapore

Largest

chainring

Link stop

max.
angle

Inner cable

SIS Adjustment

Operate the shifting lever several times to move the chain to the
2nd sprocket. Then, while pressing the lever just enough to take
up the play in the lever, turn the crank arm.

When shifting to 3rd

adjustment
barrel

Tighten the outer cable adjusting barrel
until the chain returns to the 2nd
sprocket. (clockwise)

Best setting

The best setting is when the shifting lever is operated just enough to
take up the play and the chain touches the 3rd sprocket and makes
noise.
* Return the lever to its original position (the position where the lever

is at the 2nd sprocket setting and it has been released) and then turn
the crank arm clockwise. If the chain is touching the 3rd sprocket
and making noise, turn the outer casing adjustment barrel clockwise
slightly to tighten it until the noise stops and the chain runs smoothly.

RD-TX70
RD-TX50

RD-TX30

For the best SIS performance, periodically lubricate all power-transmission parts.

When no sound at all is
heard

adjustment
barrel

Loosen the outer casing adjustment
barrel until the chain touches the 3rd
sprocket and makes noise. (counter
clockwise)

RD-TX70
RD-TX50

RD-TX30

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