| 摘要 |
A bicycle gear change mechanism has a front chain sprocket assembly (1) with at least two chain sprockets, a drive chain (19), a front derailleur (2) mounted to a carrying piece (10), a rear chain sprocket assembly (3) with at least two chain sprockets, a rear derailleur (4) mounted to a frame part (20), a chain straining device (13) including a carrying piece (5) with two tension pulleys (6), a parallelogram (7) and a carrying part (8). The rear sprocket assembly is provided with a free wheel coupling. The arrangement allows a gear shifting by rotating the drive chain backwards, that means the opposite direction to the chain drive direction. <IMAGE>
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