| 摘要 |
A bicycle is described which can be driven either by conventional rotation of the pedals, or by reciprocating movement of the saddle on the seat post. The cycle comprises two frame portions: a first fixed frame portion including an upright member (31) extending from a drive wheel axle bearing, and a second movable frame portion including said seat post (15) which has bifurcated arms (25, 26) driving transmission levers (29) for turning the drive wheel.
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