Abstract: A drive train comprising a plurality of drive wheels having an axis and for connecting to a bicycle frame, said wheel having a substantially enclosed channel about its periphery for housing a linkage skate, having an opening orientated radially outward; said channel and linkage skate cooperatively forming a clutching means; wherein said linkage skate comprises a body with connecting means on the fore and aft portion thereof; wherein at least one of said drive wheels also has means for connecting to a sprocket wheel; and a pedal assembly operatively connected to the frame operatively connected together via a cable system; wherein said cable system includes a first cable connecting the first pedal assembly to the connecting means of a first linkage skate, a second cable connecting the second pedal assembly to the connecting means of a second linkage skate, and a third cable connecting said skates via connecting means.