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General Safety Information
WARNING
• The fixing bolt for the left-side crank arm must be tightened to 45 – 55 N·m using a
torque wrench. After the bicycle has been ridden for approximately 100 km (60 miles)
or in the event of a crash, the fixing bolt should be rechecked using a torque wrench.
Inadequate tightening of the fixing bolt could cause the crank arm to fall off while
riding, resulting in a serious accident.
• Before riding, you should carefully check your crankset to make sure that there are no
cracks, and if you find any sign of a crack or any other unusual condition, do NOT use
the bicycle.
• 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 too weak or the chain is damaged, the chain should be replaced. If this is
not done, the chain may break cause serious injury.
• Obtain and read the service instructions carefully prior to installing the parts. Loose,
worn, or damaged parts may cause injury to the rider.
We strongly recommend only using genuine Shimano replacement parts.
• Read these Technical Service Instructions carefully, and keep them in a safe place for
later reference.
Note
• Make sure that the chainring combination matches the front chainwheel tooth
configuration in the Product specifications table. If other combinations are used, the
distance between the chainrings will be incorrect and the chain might slip off and get
caught in between them.
• 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
onto the next-larger rear sprocket or the one
after.
• Before riding the bicycle, check that there is no
play or looseness in the connection. Also, be
sure to retighten the crank arm fixing bolt at periodic intervals. (BB-FC, FC-PD)
• If you feel any looseness in the bottom bracket axle, the bottom bracket should be
replaced.
• In addition, if pedaling performance does not feel normal, check this once more.
• Do not wash the bottom bracket with high-pressure jets of water.
• Apply grease to the bottom bracket before installing it.
• To ensure the best performance, be sure to use only the specified type of chain. The
wide type of chain cannot be used.
• If the chain keeps coming off the chainrings during use, replace the chainrings and the
chain.
• 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.
• 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.
Technical Service Instructions
FC-M970
Specifications
Model number
Chainwheel tooth combination
Bolt circle diameter
Crank arm length
Chain line
Shell width
Thread dimensions
Installation of the front chainwheel
I Follow the procedure in the figure.
1, 2
Use the special tool TL-FC32 to install the right adapter (counterclockwise thread) and the left
adapter (clockwise thread).
Tightening torque: 35 - 50 N·m {305 - 435 in. lbs.}
3
Insert the right crank unit.
4
Before installing the left-side crank arm, check that there is no gap between the adjustment nut and
the crank arm (the nut should be fully tightened), and then set the left-side crank arm so that the axle
of the right-side crank arm unit is aligned correctly with the serrations of the left-side crank arm.
5
Insert an 8 mm Allen key and turn it clockwise to tighten the crank arm fixing bolt.
Front
Note: The crank arm fixing bolt should be periodically retightened.
chainrings
Tightening torque: 45 - 55 N·m {392 - 479 in. lbs.}
6
Use the TL-FC17 to turn the adjustment nut in order to adjust the play, and then tighten the
Rear
adjustment nut fixing bolt (2.5 mm Allen key).
sprockets
Tightening torque: Adjustment nut / 1 - 1.5 N·m {8.7 - 13 in. lbs.}
7
Turn the TL-FC35 counterclockwise to install the crank arm cap.
Note: At the time of shipment from the factory, the crank arm cap is installed to the crank arm, and
8 mm
Allen key
7
TL-FC35
SI-15H0A
Front chainwheel
44-32-22T / 44-32-24T
165 mm, 167.5 mm, 170 mm, 172.5 mm, 175 mm, 177.5 mm, 180 mm
BC1.37 (68, 73 mm)
Adjustment nut fixing bolt / 1 - 1.2 N·m {8.7 - 10.4 in. lbs.}
so use the TL-FC35 to check that it is securely tightened.
TL-FC32
4
5
2
6
TL-FC17
Adjustment nut
2.5 mm
Allen key
Adjustment nut fixing bolt
I Removal
1
Turn the TL-FC35 clockwise to
remove the crank arm cap.
FC-M970
Note: The crank arm cap and the
TL-FC35 screw have a left-hand
104 mm / 64 mm
thread [reverse thread].
This is to prevent the crank arm
from turning also when removing
the crank arm fixing bolt.
50 mm
68, 73 mm
2
Turn the TL-FC35 counterclockwise
to tighten it as far as it will go.
Check that the TL-FC35 turns 3.5
times or more at this time.
(Because of the design, the thread
may become stripped if less than
3.5 threads are engaged.)
3
Fit an 8 mm Allen key and turn it
counterclockwise to remove the
left-side crank arm.
I Spacer installation method
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 below.
68 mm (Band Type)
(2.5 mm)
73 mm (Band Type)
3
Axle
For bracket type
1
Install as shown in the
illustration.
Tightening torque :
35 - 50 N·m {305 - 435 in. lbs.}
• Be sure to read the service instructions for the Front Drive System
in conjunction with these service instructions.
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
Please note: specifications are subject to change for improvement without notice. (English)
© Jul. 2006 by Shimano Inc. XBC SZK Printed in Japan.
Crank arm cap
TL-FC35
Crank arm fixing bolt
TL-FC35
8 mm Allen key
Left-side crank arm
68mm
73mm
68 mm (Bracket Type)
(2.5 mm)
(2.5 mm)
(2.5 mm)
E-type bracket
73 mm (Bracket Type)
(2.5 mm)
Front Derailleur
Front Chainwheel
Bolt
Adapter
Adapter
3-77 Oimatsu-cho Sakai-ku, Sakai, Osaka 590-8577, Japan
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