Patent ID: 7775128

Claim:
A bicycle comprising: a frame; a pair of wheels including a driven wheel mounted to the frame; a rotatable pedal assembly mounted to the frame; a chain drive associated with the rotatable pedal assembly and configured to cause rotation of the driven wheel in response to rotation of the rotatable pedal assembly; a drive gear arrangement drivingly interconnected with the driven wheel and driven by the chain drive during operation of the rotatable pedal assembly, wherein the drive gear arrangement includes an internal cavity; and a torque sensing arrangement positioned within the internal cavity of the drive gear arrangement for measuring torque applied by a user to the drive gear arrangement through the chain drive and the pedal assembly; wherein the drive gear arrangement comprises a hollow cassette defining the internal cavity, wherein the torque sensing arrangement is positioned within the internal cavity of the hollow cassette, and wherein the hollow cassette includes a series of concentric external gears.