| 摘要 |
In a pedal crank mechanism for bicycles, each pedal crank (10D, 105) is mounted on the hub (16) of the bicycle so as to be rotatable through 180° between two positions in which the pedals fixed to the ends of the pedal (10D, 105) are respectively directed towards the outside and towards the inside relative to the vertical plane passing through each pedal crank (10D, 105).
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