Bicycle with auxiliary power unit

A bicycle with an auxiliary power unit including control means for controlling an output of a motor according to a torque value of a pedaling torque applied to a crankshaft, as detected by a torque sensor, the bicycle comprising:

• an annular hollow torque transmitting member inserted over an outer periphery of the crankshaft;
• and
• a one-way clutch, disposed on the hollow torque transmitting member, for transmitting the pedaling torque to a drive wheel when the pedaling torque, in a direction in which the bicycle with the auxiliary power unit traveling in a forward direction, is applied to the crackshaft;
• wherein a magnetic film is formed in a recess disposed in an outer periphery of the hollow torque transmitting member;
• and
• a support member for positioning and fixing the torque sensor and for rotatably supporting the torque sensor relative to the hollow torque transmitting member at end portions of the recess such that the torque sensor faces the magnetic film in the recess.