| 摘要 |
A device for a bicycle comprising a drive transmission which is coupled to the drive wheel of the bicycle and includes a gear change mechanism with a number of different size chain sprockets, a shifting means coupled to the gear change mechanism and a freewheel coupling arranged between the drive wheel and the chain sprockets. Moreover, the device comprises a disengage means (34-37) which is coupled to the shifting means (20) of the gear change device by means of a friction element (19) and a drive means (23) for enabling simultaneous disengagement of the freewheel coupling and change of gear. |
