A vehicle (10, 200, 300) comprising a frame, a front wheel and at least one rear wheel; and directly or indirectly attached to said frame, a front seat that faces forwards such that in normal use a first rider can sit thereon and to steer the vehicle as it moves forward and a rear seat for a second rider that faces backwards; having a rear rider crank assembly (42,44) and a front rider crank assembly (36) and where a wheel hub (52) and a connected rear sprocket (46), or sprocket bush (56) and a connected rear sprocket (46), are rotatably mounted around the crankshaft (42) of the rear rider crank assembly such that in use pedal power from a rear rider is first transmitted through the rear pedals (34) and rear crank assembly, via a cross-over drive chain (38), to the front rider crank assembly.