Bosch ZEMO SU-E FS 12 Translation Of Original Operating Instructions page 172

7.5.6 Checking the belt
7.5.7 Checking the belt for wear
 Check belt for indications of wear:
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Figure 181: Indications of wear on a belt
1 Carbon tensile fibres are exposed
2 Worn webbing with visible polymer
3 Missing belt tooth
4 Imbalance
5 Shark tooth
6 Cracks
 If there is one or more indications of wear,
replace belt. Contact specialist dealer.
7.5.8 Checking the belt sprockets for wear
 Check belt sprocket.
 The tooth profile is rounded and the teeth are
thick. The belt drive sprocket does not need to
be replaced.
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Figure 182: Optimum tooth profile
MY22Z01 - 12_1.0_25.07.2022
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Cleaning, servicing and inspection
 The tooth profile is pointed and teeth have
worn thinner. Replace belt sprocket. Contact
specialist dealer.
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Figure 183: Worn tooth profile
Figure 184: Photo showing example of worn tooth profile
7.5.9 Check belt tension
If the belt tension is too low, this can cause the
system to miss out a tooth or slip, i.e. the teeth on
the belt slip over the teeth on the rear wheel belt
sprocket. Excessive tension can cause damage to
the bearings, sluggishness in the system and
increased wear on the electric drive system.
The adjustment of the belt tension varies
depending on the pedelec. Common tensioning
systems include angled or vertical drop-outs,
horizontally sliding dropouts and eccentric bottom
brackets.
There are three common methods of measuring
belt tension:
• Gates Carbon Drive mobile app for iPhone® and
Android®,
• Gates Krikit tension meter and
• Eco tension tester.
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