Wireless, passive wheel-speed and cadence detection system

A detection system operable to measure the rate of rotation of a rotating component of a bicycle, the detection system comprising:

• a sensor arrangement having a first portion mounted on the bicycle and a second portion mounted on the rotating component, the sensor arrangement operable to generate an input signal representative of a revolution of the rotating component;
• a transmitter circuit operatively connected to the sensor arrangement for converting the input signal to a radio frequency signal and for transmitting the radio frequency signal;
• and
• a controller for receiving the radio frequency signal and for translating the radio frequency signal to a value indicative of a rate of rotation of the rotating component.

A method of measuring a rate of rotation of a rotatable component of a bicycle, the bicycle including frame to which the component is rotatably mounted, the method comprising:

• detecting a revolution of the rotatable component and generating an electrical signal in response thereto that is representative of the detected revolution of the rotatable component;
• converting the electrical signal to a radio frequency signal;
• and
• determining a rate of rotation of the component in response to the radio frequency signal.