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Phenomenon
Type of hub
Gear positions where
phenomenon might occur
For coaster brakes
For roller brakes/
V-BRAKE
Noise occurs when the pedals rotate.
x -
All gear positions
except 1st
Noise occurs when the bicycle is pushed backward.
x x
All gear positions
except 1st
The hub has a built-in mechanism that supports gear shifting*
and when the mechanism operates during gear shifting,
noise and vibrations occur.
x x
All gear positions
Depending on gear position, gear-shifting may feel different.
x x
All gear positions
Noise occurs when pedal rotation is stopped during riding.
x -
All gear positions
Check the following prior to performing adjustment or maintenance.
*Gear Change Support
Troubleshooting
• All of the following occurrences are due to the internal gear-shifting structure and are not the failure of the internal components.
NOTICE
•
If you cannot determine a denite cause for the malfunction, it is recommended to replace the internal assembly. (Refer to )
SHIMANO gear change support mechanism utilizes some portion of pedaling force at down shifting. The result is a quick and precise downshift
with very light feeling on both mechanical and DI2 version of the hub.
Pedaling force is applied against the sleeve to help overcome sleeve return pressure and execute the shift.
Driver rotation torque
Shifting torque
PAWL STUCK
1
1,
4
2,
3
2 3 4
SUPPORT PAWL ACTIVATED
SUPPORT PAWL TURNS SLEEVE SLEEVE PUSHES PAWL BACK
Sleeve
Sleeve
Shifting PawlShifting Pawl
Sun gear
Sun gear
40% less shifting force required
SleeveSleeve
p.55
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