| 摘要 |
A gearshift mechanism has at least two sprocket wheels on a set of driving sprocket wheels or a set of driven sprocket wheels, having shifting aids to facilitate shifting a chain up and down, it being possible for the shifting to take place under load. The shifting aids include cone rivets, which project axially out of the sprocket wheel plane and are arranged beneath the toothing of the larger one of the at least two sprocket wheels. The at least two sprocket wheels have different numbers of teeth which are selected for having the highest common divisor possible, the purpose of which is to provide as many shifting aids as possible. The positions of the sprocket wheels with respect to one another in the circumferential direction and the position of the shifting aids with respect to the teeth of the larger one of the at least two sprocket wheels are also optimized to ensure a smooth transfer of the chain from one sprocket to another.
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