Bicycle control apparatus that communicates power and data over a single transmission path

A bicycle control apparatus includes a bicycle component control unit having one of a control transmitter 430 and a control receiver; a computer control unit having the other one of the control transmitter and the control receiver 128; and a transmission path coupled to the bicycle component control unit and to the computer control unit. The control transmitter communicates both power and data to the control receiver 128 over the transmission path.