Abstract: A bicycle cycle computer includes a main unit having a primary microprocessor, a display and tlree contacts; a plurality of sensors; and a secondary microprocessor provided on the bicycle and connected between the plurality of sensors and the main unit, for receiving parallel signals outputted from the plurality of sensors, the secondary microprocessor converting the received parallel signals into a serial signal and generating a synchronous clock signal, which are transmitted to the main unit through two of the contacts of the main unit, processed by the primary microprocessor and displayed on the display.