A derailleur control apparatus comprises a control unit that receives
shift control signals. The control unit provides a first signal to
operate the derailleur a first distance from a first sprocket to a second
sprocket in response to a first shift control signal received while
operating in a riding mode, and the control unit provides a second signal
to operate the derailleur a second distance less than the first distance
in response to a second shift control signal received while operating in
the riding mode.