Shimano Dura Ace 7900 Shifters User Manual
User Manual: Shimano Dura Ace 7900 Shifters User Manual
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Assembling the bracket body and lever
body
1. 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.
2. Pass the inner cable through, and set the outer casing.
Installation to the handlebar
Move the bracket cover forward, and then securely tightening the
mounting nut with a 5 mm Allen key.
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.
Be careful not to cover the cable holes or the unit cover when
wrapping on the handlebar tape. If the handlebar tape covers these
places, it will not be possible to replace the inner cable.
Cable used
• Inner cable (PTFE inner cable) ••••••••••••••
• SLR outer casing ••••••••••••••••••••••••••••
In order to realize the best performance, we recommend that
the following combination be used.
Operate lever Bat least 9 times to set the lever
to the highest position.
Attach the same outer end cap to the cut end of the outer casing.
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).
Lever A
Lever A
start position
¤Click
⁄Click
4 3
⁄ : Shifts one sprocket
E.x. : from 3rd to 4th
35
¤ : Quick-shifts two sprockets
E.x. : from 3rd to 5th
Installation of the brake cable
Be sure to leave some excess cable, even if cutting it to the full
length of the handlebars.
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.
•Use a proper inner cable.
•It is recommended that you use an outer casing with an aluminum
cap.
SP41
SP41
Outer end cap
• Rear lever
Operate at least 9 times
Lever B
Operate lever bonce or more to set the lever to
the low position.
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).
• Front lever
1
2
3
Do not disassemble the unit cover
at the front, otherwise it may
cause problems with operation.
Be sure leave some excess in the outer casing, even if
cutting it to the full length of the handlebars.
Confirm
Make sure the outer
casing is firmly seated
in the outer stopper.
Outer stopper
Outer casing
Inner cable
f5 mm
Maintenance
* The illustration shows the right-hand lever.
Bracket and lever disassembly
1. 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.
2. 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.
General Safety Information
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.
•Before riding the bicycle, check that there is no damage such
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.
Note
•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.
•Grease the inner cable and the inside of the outer casing
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.
* Service Instructions in further languages are available at :
http://techdocs.shimano.com
Please note: specifications are subject to change for improvement without notice. (English)
© Mar. 2010 by Shimano Inc. XBC SZK Printed in Japan.
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
Lever BLever B
start position
Lever Bwill also move when lever Ais operated, but be careful
not to apply pressure to lever B. Similarly be careful not to press
lever Awhen 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.
Caution on operation
Caution on operation (FD-7900)
Lever bwill also move when lever ais operated, but be
careful not to apply pressure to lever b. Similarly be careful not
to press lever awhen 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.
Operation of front derailleur levers
• Lever a: Shifts from smaller to larger front chainring.
Operation
Lever B
Lever A:Shifts from smaller to larger rear sprocket.
Lever B:Shifts from larger to smaller rear sprocket.
Lever a:Shifts from smaller to larger chainring.
Lever b:Shifts from larger to smaller chainring.
Rear Front
Lever A
Lever b
Lever a
All levers return to the starting position when released.
Series
Shifting lever
Outer casing
Gears
Front derailleur
Front chainwheel
Rear derailleur
Freehub
Cassette sprocket
Chain
DURA-ACE
ST-7900
OT-SP41 (SIS-SP41)
20
FD-7900
FC-7900
RD-7900SS
FH-7900
CS-7900
CN-7900
SM-SP17
Bottom bracket cable guide
• Lever A: Shifts from smaller to larger rear sprocket.
Lever Ahas a click stop at positions ⁄and ¤.
Operation of rear derailleur lever
• Lever B: Shifts from larger to smaller rear sprocket.
Press lever Bonce to shift from a larger to one smaller sprocket.
34
E.x. : from 4th to 3rd
Lever a
Lever (a)
Lever a
start position
• Lever b: Shifts from larger to smaller front chainring.
Lever bLever b
start position
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
Outer plate
Chain
Smaller sprockets
Installation
Bracket cover
5 mm Allen key
When installing the components to carbon frame/handle bar
surfaces, verify with the manufacturer of the carbon frame/parts for
their recommendation on tightening torque in order to prevent over
tightening that can cause damage to the carbon material and/or
under tightening that can cause lack of fixing strength for the
components.
The correct way for clamp washer
(B) to face is so that the small
hollow on the surface is in the
top-left corner.
1. Loosen the screw and remove the name plate.
Hollow
Tightening torque:
6 – 8 N·m {52 – 69 in. lbs.}
Tightening torque:
0.2 N·m {1.8 in. lbs.}
Outer casing
Unit cover
Unit cover
Unit cover
Cable hole
Inner cable
Name plate
Installing the shifting cable
Cable used
• Inner cable (PTFE inner cable) ••••••••••
• SP41 sealed outer casing •••••••••••••••
f1.2 mm
SEALED
SP41
f4 mm
Cable hole
Handlebar tape
Cable hook
Outer casing
Special E-ring removal tool
Lever body
Bracket body
Lever stud
Inner cable drum
2. Pass the inner cable through
as shown in the illustration,
and then set the inner cable
drum into the cable hook.
Be sure to install the shifting cable cover before use. If it is not
installed, injury may occur.
CAUTION
When removing the E-ring, it may
suddenly spring out, so check the
safety of any nearby people or
objects before removing it.
CAUTION
Shifting cable cover
• Outer stopper
1. Install the outer stopper to the down tube.
Tightening torque:
1.5 - 2 N·m {13 - 18 in. lbs.}
Direct mount seat (M5)
Outer stopper
Installation bolt
3mm Allen key
Handle default
position
Install the outer stopper for the rear
chainwheels with the handle in the
default position.
Main lever support
Connector lever
(2)(1)
(1)
(2)
(A)
(B)
E-ring removal direction
E-ring
Operate at least once
Lever b
(1)
(2)
f1.6 mm
Derailleur side
4-mm cap
Plastic cap or 4-mm cap
Aluminum cap
Aluminum cap Aluminum cap
Always be sure to remove
the lever stud in this
direction. If it is removed in
the opposite direction, it
may damage the bracket
body.
Replacing the cable guide
2. Align the stud holes, and then set the special tool (1) in the
position shown in the illustration to press-fit the lever stud.
Replacing the bracket cover
The tabs on the bracket cover each fit to a matching slot on the
bracket.
Wipe a little rubbing alcohol inside the
bracket cover to make installation
easier.
Replacing the main lever support
Installation:
Insert the main lever support so that it
pushes against the lever body drop-
prevention notch.
3. Remove the special tool (1), and
then use the special tool (2) to
install the E-ring.
•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.
Note the markings:
R : for right
L : for left
Cable guide
Main lever support
Do not press-fit the lever stud
from this direction, otherwise it
may damage the bracket body.
Use this hole to replace the cable guide.
Notch
Return spring
E-ring groove
3. Install the name plate.
Tightening torque:
0.15 - 0.2 N·m {1.3 - 1.8 in. lbs.}
SI-6RT0A-004-00
Te chni c al Se r v i ce I ns tr uc t io ns SI-6RT0A-004
ST-7900
Shimano Total Integration
SM-CA70 / SM-CA50
Cable adjuster
