| 摘要 |
A shifter for a bicycle having a derailleur, comprising a housing adapted to mount to a handlebar of the bicycle. The shifter further comprising a gear connected with a cable in communication with the derailleur, which is rotatably mounted in the cavity and has first and second sets of teeth; a first pawl element biased by a first biasing member into engagement with the first set of teeth; a second pawl element biased by a second biasing member into engagement with the second set of teeth. The shifter further comprising first and second shifting levers that are movable along a parallel axis of movement with a person's thumb during a shifting operation, such that the first shifting lever moves in a natural direction of movement of the thumb to wind the gear against the resistance of a gear biasing member and advance the gear of the derailleur, and such that the second shifting lever moves along a rotational axis relative to the first lever to release the gear and lower the gear of the derailleur
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