Shimano Dura-Ace ST-7900 Інструкція з експлуатації
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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
20
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
5
3
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
Lever a
start position
Smaller sprockets
Lever b
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.
1.
Loosen the screw and remove the name plate.
5 mm Allen key
Tightening torque:
6 – 8 N·m {52 – 69 in. lbs.}
2.
Pass the inner cable through
as shown in the illustration,
and then set the inner cable
drum into the cable hook.
3.
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
Aluminum cap
4
3
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
f
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.
f
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).
f
(1)
1.2 mm
f
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.
2.
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
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.
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)
2.
Insert an Allen key or similar tool into the
1
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
3
direction. If it is removed in
Lever b
the opposite direction, it
2
may damage the bracket
body.
Lever stud
Lever body
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.
Connector lever
Main lever support
Notch
Return spring
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.
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.
3.
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)
© Mar. 2010 by Shimano Inc. XBC SZK Printed in Japan.