FC-M785
DEORE XT Front Chainwheel
FC-M785
1
2
3
6
3
4
5
7
9
8
9
7
7
10
12
11
13
5
FC
-M
98
5
FC
-M
78
0
FC
-M
77
0-1
0
14
• Chainring teeth combinations: 38-24T(AM) / 38-26T(AK) / 40-28T(AJ)
• Bolt circle diameter: 104 mm...(For outer gear), 64 mm...(For inner gear)
ITEM
NO.
1
2
3
4
5
6
7
8
9
10
11
12
*
13
*
14
SHIMANO
CODE NO.
Y1F811100
Y1MM98010
Y1MM98020
Y1MM98030
Y1MM98040
Y1MM98050
Y1MM98060
Y1MM98070
Y1MM98080
Y1KS98030
Y1FU98120
Y1F316000
Y1J198080
Y1F813000
Y1E598210
Y1TF21000
Y1J198090
Y1ML98010
Y1MM98100
Y1ML24000
Y1ML26000
Y1ML28000
Y1ML98040
Y1ML98020
Y1ML98030
INTERCHANGEABILITY
B
A
A
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
A
A
A
A
B
A
A
A
A
A
B
A
A
A
A
A
B
A
A
DESCRIPTION
Crank Arm Fixing Bolt
Left Hand Crank Arm 165 mm (Silver)
Left Hand Crank Arm 165 mm (Black)
Left Hand Crank Arm 170 mm (Silver)
Left Hand Crank Arm 170 mm (Black)
Left Hand Crank Arm 175 mm (Silver)
Left Hand Crank Arm 175 mm (Black)
Left Hand Crank Arm 180 mm (Silver)
Left Hand Crank Arm 180 mm (Black)
Clamp Bolt (M6 x 19) & Washer
Plate
Ring
Left Hand Adapter (B.C.1.37" x 24T) English Thread (SM-BB70)
Spacer (2.5 mm)
Inner Cover & O-Ring
O-Ring
Right Hand Adapter (B.C.1.37" x 24T) English Thread (SM-BB70)
Outer Gear Fixing Bolt (M8 x 7) & Nut (4 sets)
Inner Gear Fixing Bolt (M8 x 8.5 / 4 pcs.)
Chainring 24T-AM
Chainring 26T-AK
Chainring 28T-AJ
Chainring 38T-AM
Chainring 38T-AK
Chainring 40T-AJ
A
A: Same parts.
B: Parts are usable, but differ in materirals, appearance, finish, size, etc.
Absence of mark indicates non-interchangeability.
Specifications are subject to change without notice.
B
May-2012-3165A
© Shimano Inc. I
1ML0000000-6150-001
1ML0000000-6160-001
SI-5MZ0A-001-00
General Safety Information
Specifications
Chain length
Front Derailleur
WARNING
X = Available
“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.”
Model number
• In order to obtain good gear shifting performance, this chain has a forward side and a reverse side, and the
sides are marked so that the chain will face the correct way when installed. The proper design performance
will be obtained when the chain is installed so that it faces the correct way. If it is installed so that it faces the
opposite way, the chain may come off and the bicycle may fall over and serious injury may occur as a result.
• Use the reinforced connecting pin only for connecting the narrow type of chain.
• If connecting pins other than reinforced connecting pins
Reinforced
are used, or if a reinforced connecting pin or tool which is
Chain
Chain tool
connecting pin
not suitable for the type of chain is used, sufficient
connection force may not be obtained, which could cause
with groove (3)
TL-CN32
the chain to break or fall off.
10-speed super narrow
chain for
TL-CN23
• If it is necessary to adjust the length of the chain due to a
MTB
TL-CN27
change in the number of sprocket teeth, make the cut at
with groove (2)
some other place than the place where the chain has
been joined using a reinforced connecting pin. The chain will be damaged if it is cut at a place
Reinforced Connecting Pin
where it has been joined with a reinforced connecting pin.
• Be careful not to let the cuffs of your clothes get caught in the chain while riding, otherwise you
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
Link Pin
Link Pin
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.
• 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, and serious injury may occur as a result.
• 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.
• If the inner cover is not installed correctly, the axle may rust and become damaged, and the bicycle may fall over and serious injury
may occur as a result.
• 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.
Front chainwheel tooth difference
CAUTION
FD-M785
FD-M785-E2
FD-M786
FD-M786-D
X
X
X
X
Normal type
Top route type
Front derailleur installation band diameter
Chainstay angle (a)
Applicable chain line
48.8 mm
X
X
X
X
14T
12T
14T
14T
S, M, L
–
S, M, L
–
66° - 69°
66° - 69°
66° - 69°
66° - 69°
44-38T
40-38T
44-38T
44-38T
Model number
FC-M785
Chainwheel tooth combination
104 / 64 mm
104 / 64 mm
165, 170, 175, 180 mm
165, 170, 175, 180 mm
Bolt circle diameter
Crank arm length
48.8 mm
48.8 mm
68, 73 mm
68, 73 mm
BC1.37 (68, 73mm)
BC1.37 (68, 73mm)
Chain line
Bottom bracket shell width
Thread dimensions
Carry out disassembly and reassembly only when replacing the
indicator unit and the shifting lever unit.
b a
Chainstay angle
Indicator fixing screw
Tightening torque :
3 N·m {27 in. lbs.}
Fig. 1
• Install the shifting lever in a position
where it will not obstruct brake operation
and gear shifting operation.
• Do not use in a combination which
causes brake operation to be obstructed.
Gear shifting operation
To shift from the smaller chainring to the larger chainring
(Lever A)
To shift from the larger chainring to the smaller chainring
(Lever B)
When lever (A) is pressed once, there is a shift of one step from the
smaller chainring to the larger chainring.
When lever (B) is pressed once, there is a shift of one step from the
larger chainring to the smaller chainring.
Example:
Example:
From smaller chainring to larger chainring.
From larger chainring to smaller chainring.
position.
2. Remove the indicator fixing screws (a) and (b) which are securing
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.
Refer to the FD-M785 / M785-E2 / M786 / M786-D (Front
Derailleur) Service Instructions for details on installing the
front derailleur and SIS adjustment.
Connecting and securing the inner cable
Switch the mode converter to the 3x (triple mode) position, and then
check the lowest position. Operate lever B two times or more to set
the lever to the lowest position. Remove the inner hole cover, and
install the cable.
Shifting lever
Outer casing
Front derailleur
XT (2x10)
Lever (B)
CN-HG94
Bottom bracket cable guide
SM-SP17
<Disassembly>
Tightening torque:
2.5 N·m {22 in. lbs.}
M5 bolt spacer
Installation of the Front Chainwheel
1, 2 Use the special tool TL-FC32/36 to install the right adapter
(counterclockwise thread) and the left adapter (clockwise
thread).
Tightening torque: 35 - 50 N·m {305 - 435 in. lbs.}
Note : Spacers may be necessary depending on the bottom
bracket shell width. For details, refer to "Spacer
installation method”.
5
6
Insert the right crank unit.
Use the TL-FC16/18 to tighten the cap.
Tightening torque: 0.7 - 1.5 N·m {6 - 13 in. lbs.}
Push in the stopper plate and check that the plate pin is
securely in place, and then tighten the bolt of the left crank
arm. (5 mm Allen key)
Note : Each of the bolts should be evenly and equally
tightened to 12 - 14 N·m {106 - 122 in. lbs.}.
Note:
Mode converter
Wide groove area
Mode select switch
The mode converter cannot be switched while the lever is at the
lowest position. Be sure to operate lever (A) one or more times
before switching. Do not turn the mode converter by force, otherwise
it may break.
Inner hole cover
TL-FC16
2
6
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.
Inner cover
Plate pin
Push up
Cutting the outer casing
Note :
Set the stopper plate in the right direction as shown
in illustration.
Band Type
68 mm
Bracket Type
68 mm
(1) Check whether the width of the bottom bracket
shell is 68 mm or 73 mm.
(2) Next, install the adapter while referring to the
illustrations.
BB mount-type
bracket
B
Tightening torque:
0.08 N·m {0.7 in. lbs.}
pull the inner cable out of the shifting lever unit in the same way
as when installing the inner cable.
2. Remove the indicator unit by following the disassembly procedure
given in “Replacement of the indicator unit”.
3. Remove the adjustment barrel.
4. Remove the unit fixing bolt.
5. Remove the four shifting lever unit mounting screws, and then
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.
Pin plate
assembled shifting lever unit.
* Insert the projections on the pin
plate into the holes in the shifting
lever unit as shown in the
illustration.
2. Align the shifting lever unit and the
bracket, and then secure with the
four shifting lever unit mounting
screws.
* Install the M5 bolt spacer before
securing the screws.
3. Tighten the unit fixing bolt.
4. Install the adjustment barrel.
5. Install the indicator unit by following the assembly procedure
given in “Replacement of the indicator unit”.
* There is no pin plate installed to the SL-M780-I.
■ For details on reassembly without the indicator and
reassembly of the bracket band (SM-SL78), refer to the
Service Instructions for the rear drive system.
Attach the same outer end cap to the cut end of the outer casing.
Outer end cap
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
F
A
F
A
73 mm
F
A
2.5 mm
F
A
F
A
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
73 mm
Spacer
* If using a bottom bracket shell having a width of
68 mm which is a band type, an 1.8 mm spacer
and a 0.7 mm spacer can be used together
instead of a 2.5 mm spacer.
F
A
Tightening torque:
0.15 N·m {1.3 in. lbs.}
A
<Assembly>
1. Install the pin plate to the newly-
Note:
1
C
remove the shifting lever unit as shown in the illustration.
* Be careful not to mix up screws A, B, and C.
6. Remove the pin plate from the shifting lever unit.
3
5
Tightening torque:
0.5 N·m {4 in. lbs.}
1. Loosen the cable fixing bolt (nut) of the front derailleur, and then
Do not force the mode select switch to turn. If you force it to turn, it
will break.
Lever (A)
TL-FC32
4
Mode select switch
Operate lever A once to set it to the middle position. Switch the
mode converter to the 2x (double mode) position.
Set section A of the left crank into the axle of the right crank
unit where the groove is wide.
(A)
Adjustment barrel
Mode converter
Follow the procedure in the figure.
3
4
Pin plate
Shifting lever mounting screw
(Large)
Inner hole cover
OT-SP41
Chain
■ Replacement and reassembly of the shifting lever unit
C
Inner cable
• 2-WAY RELEASE
FD-M785 / FD-M785-E2 / FD-M786 / FD-M786-D
FC-M785
correctly, reassemble while paying particular attention to steps 1
and 2.
Shifting lever mounting screw
(Large)
Lever (B)
Lever (A) initial position
SL-M780-L / SL-M780-IL
Front chainwheel
secure it by tightening indicator fixing screws (a) and (b).
4. Check the operation. If the indicator unit does not operate
B
■ Spacer installation method
Series
position.
2. Check that the indicator needle is at the right edge. (Fig. 1)
3. Install the indicator unit by first engaging the catch, and then
Shifting lever mounting screw
(Small)
Stopper plate
In order to realize the best performance, we recommend that the following combination be used.
<Assembly>
1. Operate lever B two times or more to set the lever to the lowest
A
Technical Service Instructions
Front Drive System (2x10)
the indicator unit, and then lift up the lens of the indicator unit to
disengage the catch as shown in the illustration. Then remove the
indicator unit.
* Do not mix up screws (a) and (b).
If they are mixed up, damage may result.
Unit fixing bolt (M5 x 9.5 mm)
Note
SI-5MZ0A-001
Catch
<Disassembly>
1. Operate lever B two times or more to set the lever to the lowest
Note:
The INSTANT RELEASE mechanism makes fast releasing possible because cable tension is released immediately when a lever is
depressed. This release lever is equipped with a 2-way release mechanism which allows release operations to be carried out by either
pushing or pulling the lever.
Both lever (A) and lever (B) always return to the initial position when they are released after shifting.
When operating one of the levers, always be sure to turn the crank arm at the same time.
Tightening torque:
0.15 N·m {1.3 in. lbs.}
4 mm Allen key
Use a handlebar grip with a maximum
outer diameter of 32 mm.
• If the chain is on the smallest or intermediate chainring, there is the danger of injury from the tips of the teeth on the largest
chainring.
• 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.
• When installing the pedals, apply a small amount of grease to the threads to prevent the pedals from sticking. Use a torque wrench
to securely tighten the pedals. Tightening torque: 35 - 55 N·m {305 - 479 in. lbs.}. The right-hand crank arm has a right-hand thread,
and the left-hand crank arm has a left-hand thread.
• If a squeaking noise is heard coming from the bottom bracket axle and the left crank arm connector, apply grease to the connector
and then tighten it to the specified torque.
• Use a neutral detergent to clean the crank arm and the bottom bracket. Using alkaline or acidic detergents may cause discoloration.
• 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 Front
the useful life of the chainrings and the chain.
chainrings
• 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
Rear
front derailleur and generate noise. If the noise is a problem, shift the chain onto the next-larger rear
sprockets
sprocket or the one after.
• For frames with suspension, the chain stay angle will vary depending on whether the bicycle is being
ridden or not being ridden. When the bicycle is not being ridden and the chain is positioned on the
Outer casing holders
largest/larger chainring and on the smallest sprocket, the chain guide outer plate of the front derailleur may
touch the chain.
• The cuffs of your clothing may get dirty from the chain while riding.
• 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.
• The front derailleur is for double front chainwheels only. It cannot be used with triple front chainwheels, as the
shifting points will not match.
• 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 to both sides.
Furthermore, check that the shifting lever does not touch the bicycle frame when the handlebars are turned all the way.
• 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.
• 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 disassemble the indicator and shifting lever unit, as this may damage them or cause mis-operation.
• Be sure to read the service instructions for the Rear Drive System in conjunction with these service instructions (SL-M780-I).
• 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.
Replacement and reassembly of the
indicator unit and shifting lever unit
Installation of the shifting lever
SM-BB70 / SM-BB71-41A
Applicable bottom bracket
Large chainring
■ Replacement of the indicator unit
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.
40-28T
38-26T
Largest sprocket
Chain
Installation band diameters:
S (28.6 mm), M (31.8 mm), L (34.9 mm)
Chainwheel
Add 2 links (with the chain on both
the largest sprocket and the large
chainring).
F
A
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.
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)
© Jan. 2011 by Shimano Inc. XBC SZK Printed in Japan.
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