| 摘要 |
PURPOSE: A crank arm for a bicycle is provided to reduce the fatigue of a driver by reducing power required for running a bicycle. CONSTITUTION: A crank arm for a bicycle comprises a cured part(1), an eccentric mass part, and a weight part(4). The curved part is eccentric at a center line which connects a crank hub connection hole and a pedal connection hole. The eccentric mass part forms an eccentric vertex. The weight part is formed in order to increase the weight of a part with the pedal connection hole compared to a part with the crank hub connection hole. |
