Shimano Dura-Ace ST-7900 Buku Petunjuk

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SI-6RT0A-004-00

General Safety Information

Operation of rear derailleur lever

• Lever A : Shifts from smaller to larger rear sprocket.

Lever A has a click stop at positions ⁄ and ¤.

WARNING

• Obtain and read the service instructions carefully prior to

installing the parts. Loose, worn or damaged parts may cause

the bicycle to fall over and serious injury may occur as a

result. We strongly recommend only using genuine Shimano

replacement parts.

• Obtain and read the service instructions carefully prior to

installing the parts. If adjustments are not carried out

correctly, the chain may come off and this may cause you to

fall off the bicycle which could result in serious injury.

• Use the ST-7900/BL-TT79 with the BR-7900. Do not use the

BR-7900 in combination with previous STI levers for road

riding or with the BL-R770/BL-R550 brake levers for flat

handlebars, otherwise the braking performance provided will

be much too strong.

• Because of the characteristics of the carbon fiber material, you

must never modify the levers, otherwise the lever may break

and the brakes may no longer work as a result.

⁄ : Shifts one sprocket

• Before riding the bicycle, check that there is no damage such

E.x. : from 3rd to 4th

as carbon fiber peeling or cracking. If there is any damage,

replace with a new part immediately without trying to repair the

damage, otherwise the lever may break and the brakes may

no longer work as a result.

• Read these Technical Service Instructions carefully, and keep

them in a safe place for later reference.

¤ : Quick-shifts two sprockets

Note

E.x. : from 3rd to 5th

• Use a soft cloth to clean the carbon fiber levers, and be sure

to moisten the cloth with neutral detergent before using it,

otherwise the lever material may become damaged and lose

its strength.

• Avoid leaving the carbon fiber levers in places where high

temperatures are present. Also keep them well away from fire.

• Operation of the levers related to gear shifting should be made

only when the front chainwheel is turning.

• For smooth operation, use the specified outer casing and the

bottom bracket cable guide.

Operation of front derailleur levers

• Grease the inner cable and the inside of the outer casing

• Lever a : Shifts from smaller to larger front chainring.

before use to ensure that they slide properly.

• Because the high cable resistance of a frame with internal

cable routing would impair the SIS function, this type of frame

should not be used.

• A special grease is used for the gear shifting cable. Do not use

DURA-ACE grease or other types of grease, otherwise they

may cause deterioration in gear shifting performance.

• Parts are not guaranteed against natural wear or deterioration

resulting from normal use.

• For maximum performance we highly recommend Shimano

lubricants and maintenance products.

• For any questions regarding methods of installation,

adjustment, maintenance or operation, please contact a

professional bicycle dealer.

• Lever b : Shifts from larger to smaller front chainring.

Technical Service Instructions

SI-6RT0A-004

ST-7900

Shimano Total Integration

In order to realize the best performance, we recommend that

the following combination be used.

Series

DURA-ACE

Installation

Shifting lever

ST-7900

Outer casing

OT-SP41 (SIS-SP41)

Installation to the handlebar

Gears

Move the bracket cover forward, and then securely tightening the

Front derailleur

FD-7900

mounting nut with a 5 mm Allen key.

Front chainwheel

FC-7900

Rear derailleur

RD-7900SS

Freehub

FH-7900

Cassette sprocket

CS-7900

Chain

CN-7900

Hollow

Bottom bracket cable guide

SM-SP17

Cable adjuster

SM-CA70 / SM-CA50

Operation

Rear

Front

The correct way for clamp washer

(B) to face is so that the small

hollow on the surface is in the

top-left corner.

Lever B

Lever b

Lever A

Lever a

When installing the components to carbon frame/handle bar

surfaces, verify with the manufacturer of the carbon frame/parts for

Lever A : Shifts from smaller to larger rear sprocket.

Lever B : Shifts from larger to smaller rear sprocket.

their recommendation on tightening torque in order to prevent over

Lever a : Shifts from smaller to larger chainring.

tightening that can cause damage to the carbon material and/or

Lever b : Shifts from larger to smaller chainring.

under tightening that can cause lack of fixing strength for the

components.

All levers return to the starting position when released.

• Lever B : Shifts from larger to smaller rear sprocket.

Press lever B once to shift from a larger to one smaller sprocket.

Lever B

Lever A

¤ Click

Lever A

start position

⁄ Click

E.x. : from 4th to 3rd

4 3

Caution on operation

Lever B will also move when lever A is operated, but be careful

not to apply pressure to lever B. Similarly be careful not to press

lever A when operating lever B. Gears will not shift when both

levers are pressed simultaneously.

Be sure to read these service instructions in conjunction with the service

instructions for the RD-7900 before use.

If the outer plate touches the chain when the chain is at the gear

position shown in the illustration, operate lever (a) slightly to

move the derailleur so that the chain no longer touches the outer

plate.

Smaller chainring

Lever a

start position

Smaller sprockets

Lever b

start position

Chain

Caution on operation (FD-7900)

Lever b will also move when lever a is operated, but be

careful not to apply pressure to lever b. Similarly be careful not

to press lever a when operating lever b. Gears will not shift

when both levers are pressed simultaneously.

Be sure to read these service instructions in conjunction with the service

instructions for the FD-7900 before use.

Installation of the brake cable

Cable used

• Inner cable (PTFE inner cable)

Bracket cover

• SLR outer casing

• • • • • • • • • • • • • • • • • • • • • • • • • • • •

Be sure to leave some excess cable, even if cutting it to the full

length of the handlebars.

Loosen the screw and remove the name plate.

5 mm Allen key

Tightening torque:

6 – 8 N·m {52 – 69 in. lbs.}

Pass the inner cable through

as shown in the illustration,

and then set the inner cable

drum into the cable hook.

Install the name plate.

Tightening torque:

0.15 - 0.2 N·m {1.3 - 1.8 in. lbs.}

Installing the shifting cable

• Use a proper inner cable.

• It is recommended that you use an outer casing with an aluminum

cap.

Cable used

• Inner cable (PTFE inner cable)

• • • • • • • • • •

• SP41 sealed outer casing

• • • • • • • • • • • • • • •

Lever B

start position

Aluminum cap

4-mm cap

Derailleur side

Aluminum cap

Plastic cap or 4-mm cap

Cutting the outer casing

When cutting the outer casing, cut the opposite end to the end with

the marking. After cutting the outer casing,

make the end round so that the inside of the

hole has a uniform diameter.

Attach the same outer end cap to the cut end of the outer casing.

SP41

Outer end cap

SP41

• Rear lever

Operate lever B at least 9 times to set the lever

to the highest position.

Lever B

Operate at least 9 times

Lever (a)

Pass the inner cable through the cable hole. The outer casing can

Outer plate

be routed in two directions: either through cable guide (1) (inside) or

cable guide 2 (outside).

Outer casing

Cable hole

(2)

Inner cable

When removing parts in order to

replace the inner cable, the work can

be carried out more easily if the unit

cover is removed as shown in the

illustration.

Tightening torque:

0.2 N·m {1.8 in. lbs.}

Be careful not to cover the cable holes or the unit cover when

1.6 mm

• • • • • • • • • • • • • •

wrapping on the handlebar tape. If the handlebar tape covers these

places, it will not be possible to replace the inner cable.

5 mm

Handlebar tape

Cable hole

Name plate

• Front lever

Operate lever b once or more to set the lever to

Outer casing

the low position.

Cable hook

Operate at least once

Inner cable drum

Pass the inner cable through the cable hole.

The outer casing can be routed in two directions: either through

cable guide (1) (inside) or cable guide 2 (outside).

(1)

1.2 mm

4 mm

SP41

SEALED

(2)

Shifting cable cover

CAUTION

Be sure to install the shifting cable cover before use. If it is not

installed, injury may occur.

Do not disassemble the unit cover

at the front, otherwise it may

cause problems with operation.

Unit cover

• Outer stopper

1. Install the outer stopper to the down tube.

Direct mount seat (M5)

Outer stopper

Installation bolt

3mm Allen key

Tightening torque:

1.5 - 2 N·m {13 - 18 in. lbs.}

Install the outer stopper for the rear

Handle default

chainwheels with the handle in the

position

default position.

Pass the inner cable through, and set the outer casing.

Be sure leave some excess in the outer casing, even if

cutting it to the full length of the handlebars.

(1)

Outer stopper

Outer casing

Confirm

Make sure the outer

casing is firmly seated

in the outer stopper.

Inner cable

Maintenance

* The illustration shows the right-hand lever.

Bracket and lever disassembly

First use the special tool to remove the E-ring. Use part (B) of the

special tool (2) to align the E-ring with the direction of removal.

Next, set part A against the E-ring and remove the E-ring.

E-ring removal direction

Unit cover

E-ring

Special E-ring removal tool

(1)

(2)

Unit cover

CAUTION

(A)

When removing the E-ring, it may

suddenly spring out, so check the

safety of any nearby people or

objects before removing it.

(B)

Insert an Allen key or similar tool into the

lever stud hole, and then tap it gently with

a plastic mallet to push out the lever stud.

When the lever stud comes out, the

bracket body and lever body can be

disassembled.

Bracket body

Always be sure to remove

the lever stud in this

direction. If it is removed in

Lever b

the opposite direction, it

may damage the bracket

body.

Lever stud

Lever body

Assembling the bracket body and lever

body

Insert the connector lever into the main lever support, and then

assemble the bracket

body and lever body.

Next, insert the end of

the return spring into

the notch.

Connector lever

Main lever support

Notch

Return spring

Align the stud holes, and then set the special tool (1) in the

position shown in the illustration to press-fit the lever stud.

E-ring groove

Do not press-fit the lever stud

from this direction, otherwise it

may damage the bracket body.

• The correct direction for the lever stud to face is with the E-ring

groove at the top.

• Check that the surface of the bracket body is flush with the top

of the lever stud to ensure that the E-ring can fit into the

groove.

Remove the special tool (1), and

then use the special tool (2) to

install the E-ring.

Replacing the main lever support

Installation:

Insert the main lever support so that it

pushes against the lever body drop-

prevention notch.

Main lever support

Replacing the cable guide

Cable guide

Use this hole to replace the cable guide.

Replacing the bracket cover

The tabs on the bracket cover each fit to a matching slot on the

bracket.

Note the markings:

R : for right

L : for left

Wipe a little rubbing alcohol inside the

bracket cover to make installation

easier.

One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003

Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222

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

* Service Instructions in further languages are available at :

http://techdocs.shimano.com

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