| 摘要 |
A bicycle crank arm is provided with a crank body, a reference member and a sensor. The crank body has a crank axle mounting portion and a pedal mounting portion. The reference member is attached to the crank body. The sensor is attached to at least one of the crank body and the reference member. The sensor is arranged to output a signal based on a distance between the crank body and the reference member. |
