Front Drive System

SI-6MSFA-002-00
General Safety Information
Specifications
Front Derailleur
WARNING
Model number
• The ST-M770/ST-M775 DUAL CONTROL lever is used for both gear shifting and braking operations.
Make sure that you fully understand and are accustomed to the gear shifting and braking operations for your bicycle. Refer to
the illustration for the method of operation.
• Braking can only be performed with the DUAL CONTROL lever. If you use the gear shifting release lever (Auxiliary release
lever) for braking, the release lever may become damaged and you may lose control of the bicycle, which could result in an
accident.
• If the internal unit of the DUAL CONTROL lever becomes damaged, the lever will move down from the normal lever position,
and it may move to a position where braking is difficult to carry out. If this happens, you should stop riding the bicycle
immediately.
• Use the reinforced connecting pin only for connecting the narrow type of chain.
• There are two different types of reinforced connecting
Reinforced
pins available. Be sure to check the table before
Chain
Chain tool
connecting pin
selecting which pin to use. If connecting pins other than
reinforced connecting pins are used, or if a reinforced
9-speed super narrow
Silver
chain such as
TL-CN32 / TL-CN27
connecting pin or tool which is not suitable for the type
6.5mm
CN-7701 / CN-HG93
of chain is used, sufficient connection force may not be
8/
7/
6-speed
narrow
obtained, which could cause the chain to break or fall
Black
chain such as
TL-CN32 / TL-CN27
off.
7.1mm
CN-HG50 / CN-HG40
• If it is necessary to adjust the length of the chain due
to a change in the number of sprocket teeth, make the cut at some other place than the place
Reinforced Connecting Pin
where the chain has been joined using a reinforced connecting pin or an end pin. The chain will
be damaged if it is cut at a place where it has been joined with a reinforced connecting pin or an
end pin.
• Be careful not to let the cuffs of your clothes get caught in the chain while riding, otherwise you
End Pin
Link Pin
may fall off the bicycle.
• Check that the tension of the chain is correct and that the chain is not damaged. If the tension is too weak or the chain is
damaged, the chain should be replaced. If this is not done, the chain may break and cause serious injury.
• Use a front chainwheel which is compatible with 9-speed chains in conjunction with Shimano CN-7701, CN-HG93 and CNHG73 chains. If a chainwheel for an 8-speed chain or less is used, front chainwheel gear shifting problems may occur, or the
chain pins might fall out, causing the chain to break.
• The two left crank arm mounting bolts should be tightened alternately in stages rather than each bolt being fully tightened all at
once. Use a torque wrench to check that the final tightening torques are within the range of 12 - 14 N·m.
Furthermore, after riding approximately 100 km (60 miles), use a torque wrench to re-check the tightening torques.
It is also important to periodically check the tightening torques. If the tightening torques are too weak or if the mounting bolts are
not tightened alternately in stages, the left crank arm may come off and the bicycle may fall over.
• Check that there are no cracks in the crank arms before riding the bicycle. If there are any cracks, the crank arm may break and
you may fall off the bicycle.
• 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.
• Read these Technical Service Instructions carefully, and keep them in a safe place for later reference.
Top route type
Note
Adjusting the grip width
• In addition, if pedaling performance does not feel normal, check this once more.
• Before riding the bicycle, check that there is no play or looseness in the connection. Also, be sure to retighten the crank arms
and pedals at periodic intervals.
• Do not wash the bottom bracket with high-pressure jets of water.
• If you feel any looseness in the bearings, the bottom bracket should be replaced.
• If gear shifting operations do not feel smooth, wash the derailleur and lubricate all moving parts.
• If the amount of looseness in the links is so great that adjustment is not possible, you should replace the derailleur.
• You should periodically wash the chainrings in a neutral detergent and then lubricate them again. In addition, cleaning the chain
with neutral detergent and lubricating it can be an effective way of extending the useful life of the chainrings and the chain.
• If the chain keeps coming off the chainrings during use, replace the chainrings and the chain.
• When the chain is in the position shown in the illustration, the chain may contact the front
chainrings or front derailleur and generate noise. If the noise is a problem, shift the chain
Front
onto the next-larger rear sprocket or the one after.
chainrings
• Apply grease to the left and right adapters before installing them.
• For smooth operation, use the specified outer casing and the bottom bracket cable guide.
• This front derailleur is for triple front chainwheel use only. It cannot be used with the
Rear
double front chainwheel, as the shifting points do not match.
sprockets
• When installing the top route type, choose a frame that has three outer casing holders as
shown in the illustration at right.
• Use an outer casing which still has some length to spare even when the handlebars are turned all the way Outer casing holders
to both sides. Furthermore, check that the shifting lever does not touch the bicycle frame when the
handlebars are turned all the way.
• Make sure that the gear shifting cable and the brake cable do not obstruct each other during braking
operations. If they do obstruct, it may interfere with braking.
Install the cables so that they still have some slack in them even when the handlebars are turned fully in
either direction.
• A special grease is used for the gear shifting cable (SIS-SP41). Do not use DURA-ACE grease or other
types of grease, otherwise they may cause deterioration in gear shifting performance.
• Grease the inner cable and the inside of the outer casing before use to ensure that they slide properly.
• Operation of the levers related to gear shifting should be made only when the front chainwheel is turning.
• If the brake fluid used in the oil disc brakes is of a type which tends to adhere to the plastic parts of the shifting lever, this may
cause the plastic parts to crack or become discolored. Therefore, you should make sure that the brake fluid does not adhere to
these plastic parts.
The mineral oil which is used in SHIMANO disc brakes does not cause cracking or discoloration if it adheres to plastic parts, but
such parts should be cleaned with alcohol beforehand to prevent foreign particles from adhering.
• Do not use the fixing bolt (made from aluminum) for the auxiliary release lever cap to secure the auxiliary release lever.
• 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.
X
Normal type
SI-6MSFA-002
Front Drive System
Series
DUAL CONTROL lever
Outer casing
Front derailleur
Front chainwheel
Chain
Bottom bracket cable guide
X
X
X
X
Front chainwheel tooth difference
22T
22T
22T
22T
Min. difference between top and intermediate
12T
12T
12T
12T
–
S, M, L
S, M, L
S, M, L
Chainstay angle (a)
66° - 69°
66° - 69°
66° - 69°
63° - 66°
Applicable chain line
50 mm
50 mm
50 mm
50 mm
44T
44T / 48T
44T
44T / 48T
Front derailleur installation band diameter
Applicable front chainwheel
Installation band diameters:
S (28.6 mm), M (31.8 mm), L (34.9 mm)
3. Top adjustment
Set so that the clearance
between the chain guide outer
plate and the chain is 0 - 0.5
mm.
1. Low adjustment
44-32-22T
48-36-26T
104 mm / 64 mm
104 mm / 64 mm
165 mm, 170 mm, 175 mm, 180 mm
165 mm, 170 mm, 175 mm, 180 mm
50 mm
50 mm
68, 73 mm
68, 73 mm
BC1.37 (68, 73mm)
BC1.37 (68, 73mm)
Chainwheel tooth combination
Bolt circle diameter
Crank arm length
FC-M771-K
Be sure to follow the sequence described below.
Chain line
Bottom bracket shell width
Thread dimensions
Largest
chainring
Top adjustment
screw
Chain guide
outer plate
FD-M770/M772/M772A
FD-M770/M772/M772A
Chain
4. Adjustment of the intermediate chainring
Low adjustment
screw
Operating the levers
■ Operating the brake
lever
Chain position
■ Gear shifting operation
The INSTANT RELEASE
mechanism makes fast gear
shifting possible because cable
tension is released immediately
when either the main lever or
the secondary release lever is
depressed.
Largest
sprocket
Smallest
chainring
The lever always returns to the initial position when it is released
after shifting. When operating the lever, always be sure to turn the
crank arm at the same time.
Chain guide
inner plate
When lever is pressed once, there is a shift of one step from a
small chainring to a larger chainring.
Example: from intermediate chainring to largest chainring.
Chain
Chain guide
inner plate
2. Connecting and securing the inner cable
Chain
Operate the lever 2 or more times to set the lever to the lowest
position. After removing the inner hole cover and opening the
cover, pass the cable through the outer casing adjustment bolt.
Pull the inner cable all the way through so that the end of the
inner cable is set onto the hook, and then close the cover.
Lever initial position
1st joint
Approx.
2 mm
Intermediate
chainring
After completion of steps 1 - 4, move the shifting lever to check the
shifting. (This also applies if shifting becomes difficult during use.)
Cover
If the chain falls to the crank
side.
Tighten the top adjustment screw
clockwise (about 1/4 turn).
When lever is pressed once, there is a shift of one step from a
large chainring to a smaller chainring.
If shifting is difficult from the
intermediate chainring to the
largest chainring.
Loosen the top adjustment screw
counterclockwise
(about 1/8 turn).
Example: from largest chainring to intermediate chainring.
If shifting is difficult from the
intermediate chainring to the
smallest chainring.
Loosen the low adjustment screw
counterclockwise
(about 1/4 turn).
Inner hole cover
Lever end
Tighten the top adjustment screw
If there is interference between
the chain and the front derailleur clockwise (about 1/8 turn).
inner plate at the largest
chainring.
Inner hole cover
Becomes
wider
Install the inner hole cover by turning it
as shown in the illustration until it stops.
Do not turn it any further than this,
otherwise it may damage the thread on
the cover.
Lever initial position
Auxiliary release lever
Becomes
narrower
Becomes wider
2 mm Allen key
Cutting the outer casing
ST-M775
■ Note
Outer end cap
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.
Front Derailleur
Install as shown in the
illustration.
Front Chainwheel
The level section of the chain guide
outer plate should be directly above
and parallel to the largest chainring.
Secure using a 5 mm Allen key.
Chainwheel
(largest chainring)
Attach the same outer
end cap to the cut end of
the outer casing.
If the intermediate chainring is
skipped when shifting from the
largest chainring.
Loosen the outer casing
adjustment barrel
counterclockwise (1 or 2 turns).
If the chain falls to the bottom
bracket side.
Tighten the low adjustment screw
clockwise (about 1/2 turn).
If the lever is stiff when shifting
from the intermediate chainring
to the largest chainring
Loosen the top adjustment screw
counterclockwise (about 1/4
turn).
• FD-M770/M772/M772A
< Normal type >
Bolt
Loosen the top adjustment screw
If there is interference between
the chain and the front derailleur counterclockwise
(about 1/8 turn).
outer plate at the largest
chainring.
If there is interference between
Tighten the outer casing
the chain and front derailleur
adjustment barrel clockwise
inner plate when the rear
(1 or 2 turns).
sprocket is shifted to the largest
sprocket when the chainwheel is
at the intermediate chainring
position.
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.
Installation of the Front Derailleur
For bracket type
Largest
sprocket
Outer casing adjustment
barrel
5. Troubleshooting chart
To shift from a large chainring to a smaller chainring
ST-M770
Chain position
Hook
It is recommended that you adjust the grip widths of the levers to
the most comfortable widths for gear shifting and braking.
Becomes
narrower
When carrying out adjustment, set the
chain to the largest sprocket, and at the
front, set the chain to the intermediate
chainring. Adjust using the outer casing
adjustment barrel so that the clearance
between the chain guide inner plate and
the chain is 0 - 0.5 mm.
To shift from a small chainring to a larger chainring
< Top route type >
Chain guide
Note:
Pass the cable
through as shown
in the illustration.
Adapter
Tightening torque :
35 - 50 N·m {305 - 435 in. lbs.}
Wire
fixing bolt
Adjust and then install the front derailleur as shown in the
illustration. Do not remove the Pro-Set alignment block at this time.
5 mm Allen key
Chain length
Pro-Set alignment block
Add 2 links (with the chain on both
the largest sprocket and the largest
chainring)
Largest sprocket
Largest chainring
• FD-M771/FD-M773
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.
Note:
Pass the cable through as shown
in the illustration.
Pro-Set gauge
FD-M771
FD-M773
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
Chain
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
SIS-SP41
Wire fixing bolt
FC-M770 / FC-M771-K
CN-HG93
Smallest
sprocket
FD-M771/M773
FD-M770 / FD-M771 / FD-M772 / FD-M773 / FD-M770-E / FD-M772A
SM-SP17 / SM-BT17
FD-M771/M773
Chain position
First remove the Pro-Set alignment block. Next, set so that the
clearance between the chain guide inner plate and the chain is 0
- 0.5 mm.
Pro-Set alignment
block
XT
ST-M770 / ST-M775
Pull
Pull
Chainstay angle
FC-M770
Top route type
Tightening torque :
6 - 8 N·m {53 - 69 in. lbs.}
SIS Adjustment
Model number
Normal type
When using the S, M size, use an
installation band with a diameter of
28.6 mm, 31.8mm and install it to a
L size adapter.
Chainwheel
Gear teeth
should come
within this range
In order to realize the best performance, we recommend that the following combination be used.
FD-M772 / M772A
FD-M773
X
X
Adapter
Technical Service Instructions
FD-M771
X
4 mm Allen key
Use a handlebar grip with a maximum
outer diameter of 32 mm.
X = Available
FD-M770-E FD-M770
“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.”
After taking up the initial slack in the cable, re-secure to the front
derailleur as shown in the illustration.
Installation of the lever
■ Be sure to read the service instructions for the FC-M770/M771-K Front Chainwheel in conjunction with these service
instructions.
Tightening torque :
6 - 7 N·m {53 - 60 in. lbs.}
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)
© Oct. 2009 by Shimano Inc. XBC SZK Printed in Japan.