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Troubleshooting
Check the following prior to performing adjustment or maintenance.
• All of the following occurrences are due to the internal gear-shifting structure and are not the failure of the internal components.
Noise occurs when the pedals rotate.
Noise occurs when the bicycle is pushed backward.
The hub has a built-in mechanism that supports gear shifting*
and when the mechanism operates during gear shifting,
noise and vibrations occur.
Depending on gear position, gear-shifting may feel different.
Noise occurs when pedal rotation is stopped during riding.
*Gear Change Support
SHIMANO gear change support mechanism utilizes some portion of pedaling force at down shifting. The result is aquick and precise downshift
with very light feeling on both mechanical and DI2 version of the hub.
40% less shifting force required
Pedaling force is applied against the sleeve to help overcome sleeve return pressure and execute the shift.
1, 4
Shifting torque
Driver rotation torque
1
Shifting Pawl
Sun gear
Sleeve
PAWL STUCK
•
If you cannot determine a definite cause for the malfunction, it is recommended to replace the internal assembly. (Refer to
Phenomenon
2, 3
2
Sleeve
SUPPORT PAWL ACTIVATED
Type of hub
For coaster brakes
x
x
x
x
x
3
Sleeve
SUPPORT PAWL TURNS SLEEVE
NOTICE
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Gear positions where
phenomenon might occur
For roller brakes/
V-BRAKE
All gear positions
-
except 1st
All gear positions
x
except 1st
x
All gear positions
x
All gear positions
-
All gear positions
4
Shifting Pawl
Sun gear
Sleeve
SLEEVE PUSHES PAWL BACK
p.51
)
46
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Table of Contents
Troubleshooting
