| 摘要 |
PROBLEM TO BE SOLVED: To provide a bicycle capable of widely responding to a change of a rider's physique by varying a joint distance and an angle between a front frame holding a handle bar and a rear frame holding a seat and a pedal of a conventional bicycle. SOLUTION: The bicycle is equipped with at least one or more of a frame joint distance varying part 4 which connects a frame joint part 3 of the front frame 1 and the rear frame 2 through a turnable pivot. A rotating crank 7 of a pedal 6 has a crank length varying means varying a pedal rotation radius. The horizontal distance between the handle bar and the seat, the vertical distance between the seat and the pedal, and the crank rotation radius of the pedal are easily and surely varied thereby to universally respond to growth of body height or difference of the physique, and inexpensively provide the bicycle capable of safely and comfortably traveling. COPYRIGHT: (C)2007,JPO&INPIT
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