I:SY E5 ZR F, Translation Of The Original Operating Instructions, Page: 37 / 258

MY23I0a - 42_1.0_29.08.2023
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Description
3.3.4.7 Hub
The hub is located in the centre of the wheel. The
hub is connected to the rim and tyre with the
spokes. An axle runs through the hub, connecting
the hub with the fork at the front and with the
frame at the rear.
The hub’s main task is to transfer the pedelec’s
force of weight to the tyres. Special hubs on the
rear wheel perform additional functions. There is
a distinction between five types of hub:
• Hubs without additional features
• Brake hub (see back-pedal brake)
• Gear hub, also known as a hub gear
• Generator hub (for bicycles only)
• Motor hubs (for front- and rear-driven pedelecs
only).
Hub without additional features
The front wheel hubs on pedelecs with central or
rear motors are normally hubs without additional
features.
Figure 18: Example of front wheel hub: SHIMANO
1 Hub axle
2 Quick release
3 Hub body
4 Ball bearings
1
2
3
4
4