| 摘要 |
According to the present invention, a chainless bicycle comprises a pedal and a crank arm performing an up-and-down motion which allows a gear unit to rotate with a hub spindle of a rear wheel, wherein the gear unit is coupled to a hub of the rear wheel and the hub spindle and allows the hub and the rear wheel to rotate together, thereby, the bicycle can run forward smoothly. Thus, the chainless bicycle has reduced weight due to a simplified structure and reduced number of components. |
