Shimano RD-7970, RD-7970-A, SM-RD79-A Installation Manual

Bracket tightening torque:

8 - 10 N·m

SI-5X20A-005-00

General Safety Information

WARNING

“Maintenance interval depends on the usage and riding circumstances. Clean regularly the chain with an appropriate chaincleaner. Never use alkali based or acid based solvents such as rust cleaners. If those solvent be used chain might break and cause serious injury.”

•In orde r to obtain good gear shif ting performance, th e CN-79 01 has a for ward si de and a reve rse sid e,

and the sides are marked so t hat the CN-7901 will face the correc t way when install ed. The p roper d esign performance will be ob tained when the C N-7901 is installed so t hat it face s the correct way. If it is installed so th at it faces the opposite way, the chain may come off and the bicycle may fall over and seriou s injur y may occur as a result.

•Use the reinforced conne cting pin only fo r connecting th e narrow t ype of chain.

•If conne cting pins other than rei nforce d connecting pi ns are used, or if a reinforced connecting pi n or tool which is not suitable for the type of c hain is us ed, sufficient co nnec tion force may not be obtained, which could c ause th e chain to break or f all off.

•Make sure that the connecting pin is aligned with the ou ter link sur face fro m the side t hat the pin is inserted. It shoul d feel smooth and f lush wh en you run your finger over it . The pin will protrude s lightly on the backside after the break off pin i s remove d.

•If it is necessa ry to adjust the length o f the chain d ue to a change i n the numb er of sprocket tee th, make the cut at some other plac e than the p lace whe re the chain has been joined u sing a reinforce d connecting pi n. The chain will be damaged if it is cu t at a place w here it has been joined wi th a reinfor ced conn ecting pin.

•Check that the tension of th e chain is correc t and that the chain is not damag ed. If the tensio n is too weak or the chain is damaged, the chain should be replaced . If this is no t done, the chain may break an d cause s erious injury.

•Obtai n and read the ser vice ins truct ions ca refully prior to install ing the pa rts. Loose, worn or damaged part s may cau se the bic ycle to fa ll over and s eriou s injury may occur as a resul t. We stro ngly recommen d only using genuine Shima no replacemen t part s.

•Obtai n and read the ser vice ins truct ions ca refully prior to install ing the pa rts. If adjus tment s are not carrie d out correctl y, the chain m ay come of f and thi s may cause you to fall off the bicycle w hich coul d result i n seriou s injur y.

•Read the se Technic al Ser vice Instruc tions c arefully, and keep them in a saf e place fo r later referenc e.

10-speed

super narrow chain

such as CN-7901

Reinforced

connecting pin

with

groove (3)

with

groove (2)

Reinforced Connecting Pin

Link Pin Link Pin

Chain toolChain

TL-CN32 TL-CN23 TL-CN27

Technical Service Instructions

In order to realize the best performance, we recommend that the following combination be used.

Series Dual control lever Gears Electric cable Battery

Rear derailleur

Typ e Freehub Cassette sprocket Chain

Specifications

Typ e Total capacity Largest sprocket Smallest sprocket Front chainwhee l tooth differe nce

Installation of the rear derailleur

When in stalli ng the rear derailleur, make sure that the B-tensio n adjus tment b olt doe s not touch the fork of the drop out and c ause it to bend.

Note

<RD-7970 / RD-7970-A>

•Be sure to adjust t he top adjustme nt bolt and the low adjustm ent bolt by followi ng the procedur es in

the Ser vice In struc tions . If thes e bolts a re not adj usted , the chain may become clam ped between the spokes a nd the largest sprocket a nd the wh eel may lo ck, or the chain may slip onto the smallest sprocket .

•If the amo unt of loo seness in the lin ks is so great that adjustment is n ot possible, yo u should r eplace t he derailleur.

•Period ically cl ean the derailleu r and lubricate all moving parts and pulley s.

•If gear shiftin g adjus tment cannot be c arried out, check the de gree of paralleli sm at the re ar end of th e bicycle.

•If you hear abnorm al noise as a resul t of looseness in a pulley, you s hould re place th e pulley.

•The ten sion pulley has a mark which in dicates the directio n of rotation. The side with the arrow i s the fron t side.

•Be sure to u se the following to ols whe n removing cables. RD -797 0:T L- EW01 RD -797 0-A :TL-E W02

•Be caref ul not to le t water get into the terminal .

•For any qu estio ns regarding me thods of installation , adjus tment , maintenance or o peration, plea se contact a professional bicycle deal er.

•Products are not guara nteed a gainst natural wear and de teriora tion fro m normal u se and ag ing.

•For maximum performance we highly recommend Shimano lubricants and maintenance products.

<SM-RD79-A> Be sure to also inform users of the following:

•This is a small waterproof connec tor. Do not re peat con necting and di sconnecting it. It may impair th e function.

•Be caref ul not to le t water get into the terminal .

•The components are de signed to be fully waterproofed to w ithst and wet w eather r iding condition s; however, do not deliberately place them into water.

•Do not cle an the bic ycle in a hi gh-p ressu re wash. If water gets into a ny of the com ponen ts, op erating problems or ru sting ma y result .

•Handle t he products c arefully, and avoid subjec ting them to any st rong sho cks.

•Do not us e thinners or similar subs tance s to clean th e produ cts . Such sub stan ces may da mage the surfaces.

•Do not leave the pro duct in an area ex posed to strong sunligh t for an ex tende d perio d of time.

•Do not disasse mble the product as it cannot be reassembled .

•When cleaning th e produ ct, use a cloth moistened with a d iluted n eutral d eterge nt.

•Be sure to u se the Shi mano ori ginal too ls TL-EW 01 and TL-E W02 whe n removing elec tric wir es.

•Be sure to u se the sp ecifie d elec tric wire.

•Secure the elec tric wires with p lastic tape so t hat they d o not inte rfere w ith the ch ainring s, spr ockets a nd tires .

•Before riding check that the rubber band is n ot cracke d or damag ed. If th e rubbe r band is cracked or damaged use a new one.

•If the dou ble- sided tape on SM-RD79-A pe els off, replace it with a new one.

•Products are not guara nteed a gainst natural wear and de teriora tion fro m normal u se and ag ing.

•For maximum performance we highly recommend Shimano lubricants and maintenance products.

Notes when reinstalling and replacing components

•When in stalli ng to the bicycle, do not for cibly be nd the electri c wire plug. It may re sult in a po or contact.

The ac tual pro duct may diffe r from the illustration be cause this manu al is intended chiefly to ex plain the procedure s for using the pro duct .

* Guide pulley / tension pulley tightening

torque:

2.5 - 3 N·m

Chain length

Note:

In order to obtain good gear shifting performance, the CN-7901 has a forward side and a reverse side, and the sides are marked so that the CN-7901 will face the correct way when installed.

(outer side)

(inner side)

About RD Protection

Rotate the front chainwheel when activating RD Protection Reset. If the bic ycle re ceives a s trong impact , the RD Protection ope rates an d the conn ection between the m otor and the link is mome ntaril y severe d so that the rear de railleur will no longer ope rate. If th is happens, ho ld down the rear derailleur ad justm ent but ton on ju nctio n (A) of SM -EW79A for 5 s econd s or long er to activate RD Prote ction R eset , which will resto re the connecti on bet ween the motor an d the link. If RD Protectio n Reset d oes not activa te, manu al recove ry is al so possible. Co nsult with a dist ributo r in advan ce.

SI-5X20A-005

RD-7970 / RD-7970-A / SM-RD79-A

Rear derailleur

DURA-ACE

ST-7970

EW-7970 / SM-EW79A

SM-BTR1

RD-7970

Forward

The side with the mark shown in the illustration is the

Reverse

Junction (A)

Rear derailleur

adjustment button

RD-7970-A / SM-RD79-A

CS-7900 (Except for 11-28T)

32 teeth or less

27 T 11 T

16 teeth or less

Fork of dropout

B-tension adjustment bolt

Pulley cage

forward side (outer side).

FH-7900

CN-7901

Refer to the Service Instructions for the electric cable when connecting and routing the electric cable.

5 mm Allen key

Smallest

sprocket

Guide pulley

Tension pulley

Right angle to the ground

Illuminates (red)

90°

Chain

Largest

chainring

Installation of RD-7970-A / SM-RD79-A

LIST OF TOOLS TO BE USED:

•Tool used w hen conn ecting/removing the elec tric wire to/fr om RD-7970 : TL-EW01

•Tool used w hen conn ecting/removing the provided 200mm ele ctric w ire: TL-EW02

Attac h SM-RD79-A to t he seat s tay of the bicycl e frame.

Not compatible with seat stays with a cross-sectional width greatly exceeding the width of SM-RD79-A.

SM-RD79-A

EW-7970

EW-SD50

SM-RD79-A

RD-7970-A

Note: Us e SM- RD79-A in combina tion with RD-7970 -A.

Use the p rovide d 200m m elec tric wire (EW-SD50) to con nect S M-R D79-A an d RD-7970 -A. RD-7970 -A / SM -RD79 -A are not c ompatible with E-TUBE PROJECT.

1. Shift to the largest fro nt chainring and to the smallest rear sprocke t. Wipe th e dirt an d dust off the frame, and i f the frame is wet, d ry it well before attaching.

2. There are two types of rubber s heet. Choos e the rubber she et that fi ts the frame. Peel the r ubber s heet fr om its release liner and at tach it to SM- RD79- A. Be caref ul abou t the orie ntatio n of the rub ber sheet. Attac h it with it s wider side faci ng the con nector. After a ttaching the rubber sheet, h old down the entire surface w ith your f inger fo r approx imatel y 1 minute.

3. Provisionally a ttach SM-RD79-A to t he frame u sing the rubber band. Connect the ru bber band to one of the hook s, pull it around a nd then attach it to the oth er hook .

4. Remove the elec tric wire from RD -7970 using t he Shiman o origina l tool TL-E W01. Remove R D-7970 and a ttac h RD-7970 -A.

SM-RD79-A

Hook

Rubber Sheet (Y7G998010)

Frame

Rubber Band (Y7G900050)

5. Pass the electric wire through th e provid ed Shimano original tool TL-EW02. Set so that the projection on the co nnec tor is alig ned with the g roove on the narrow e nd.

TL-EW02

Plug

When installing the electric wire, do not forcibly bend the plug. It may result in a poor contact. When connecting the electric wire, push it in until it clicks in place.

6. Connect the fo llowing 2 e lectric wires to SM- RD79-A :

•Elect ric wire di sconnecte d from RD -7970

•Provided 200 mm elec tric wire (EW-SD50)

Hold the wireless unit in your hand when connecting or disconnecting the electric wire from SM-RD79-A.

When inserting the electric wire removed from RD-7970,



marks on

align the SM-RD79-A and the plug.

7. C onnec t the ele ctric wire to RD -7970-A.

8. Check the exces s lengt h of the ele ctric w ire. (Pu sh up the re ar derailleur until it makes co ntac t with the

frame an d keep it in th at posi tion whe n checking the electric wires.) If the ele ctric w ire doe s not have enough slack, make some f ine adju stments to the h eight of SM-RD79-A.

9. Secure SM-R D79-A to the frame.

10. Secure the elec tric wire to the frame.

If the electric wire is too long, it may interfere with the cassette sprocket or chain. Use plastic tape, etc. to secure the slack electric wire to the frame.

Please n ote: spe cificat ions are s ubjec t to change f or improv ement wi thout no tice. (Eng lish) © Apr. 2016 by Sh imano In c. HTR

Button held

down

When th e red LED on junction (A) is illumina ted, the rear derailleur cannot shift gears. Pr ess the rear derailleur adju stmen t button until th e red LED tu rns off.

Illuminates (red) Flashes (red)

Approx. 5-second period

RD protection

reset

Complete

Refer to the Service instructions for the ST-7970 for details on stroke adjustment.