| 摘要 |
A gear crank for a bicycle, comprising a crank shaft, a pair of crank arms, and a chain gear has crank arm mounting portions at both axial ends of the crank shaft provided with supports having round outer peripheral surfaces and, axes offset with respect to the axis of rotation of the crank shaft respectively. The crank arms are removably mounted to the supports to allow for a changing of the angular position of the crank arms relative to the supports, whereby the angular positions are changed to adjust the length between the axis of rotation of the crank shaft and the utmost end of each crank arm.
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