| 摘要 |
A bicycle includes a frame, a pedaling device, a sprocket device, a stepping device and a clutch device. The pedaling device is furnished on the frame for a rider to perform pedaling operation. The sprocket device includes an axle pivotally coupled to the frame and a front sprocket rotatably mounted on the axle. The stepping device is connected between the pedal device and the sprocket device for transmitting power from the pedal device to rotate the axle and increasing moment of force of the pedaling operation by a reciprocal stepping operation. The clutch device is furnished on the frame for performing a first position to engage with the front sprocket so that the front sprocket is driven together with the axle by the stepping device to rotate, and a second position to disengage from the front sprocket so that the front sprocket is free from driven by the stepping device.
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