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yxcyxc Pedelec components
5.9.1 Derailleur gear system
1 2 43
567
Fig. 17 Derailleur gear system
1. Rear Bowden cable 5. Chain
2. Gear rim cassette 6. Front derailleur
3. Front derailleur 7. Rear derailleur
4. Front sprockets
Depending on the model, a pedelec with a derailleur gear system has 1 to 3 differently sized
sprockets at the height of the pedals and 7 to 12 differently sized pinions on the gear rim
cassette on the rear wheel hub. The different gears result from the different sprocket/pinion
combinations through which the chain can run.
The front derailleur is attached to the seat tube next to the front sprocket. The front derailleur
guides the chain from one sprocket to the other. The rear derailleur is responsible for
changing from one pinion to another on the gear rim cassette. The front and rear derailleurs,
i.e. the setting of the desired gear, are usually controlled with two control elements on the
handlebars.
For optimal cycling characteristics, it is necessary to increase the assistance level and the
gear according to the speed of travel, starting at level 1 in first gear. The same principle
applies in reverse when shifting down.
● Pedal slowly and without effort when shifting gears.
● Shift down in good time before climbs.
● Only operate switching combinations according to the circuit diagram.
● Avoid excessive skewing of the chain.
● Adjust the gear shift if necessary. See “Adjusting the derailleur gear system” on page
88.
● Check chain tension regularly. See “Checking the chain tension” on page 84.
45


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