Patent ID: 8640805

Claim:
A bicycle with an auxiliary power unit including a detecting controller configured to detect a torque value of a pedaling torque applied to a crankshaft for controlling an output of a motor according to the torque value detected, the bicycle comprising: a power transmission configured to output the pedaling torque applied to the crankshaft to a drive wheel and including a clutch unit, wherein the clutch unit includes a one-way ratchet permitting an output of a driving force of the motor to the drive wheel, but not an output of power from the drive wheel to the motor; and a selection device configured to select whether or not to permit transmission of power from the drive wheel to the motor; wherein the clutch unit further includes a lock-up ratchet cooperating with the selection device to selectively permit an output of power from the drive wheel to the motor according to an operation of the selection device.