A small, usually gasoline-powered engine mounted above the rear bicycle wheel and using a curler to transmit energy on to the tire constitutes this sort of propulsion system. A easy centrifugal clutch engages the curler with the tire when the engine reaches a sure velocity, propelling the bicycle ahead. Variations exist, together with some fashions utilizing a friction wheel towards the entrance tire.
This simple design affords a number of benefits. Its simplicity interprets to ease of set up and upkeep, usually requiring minimal instruments and mechanical experience. The comparatively low value in comparison with different motorized bicycle choices makes it a pretty entry level. Traditionally, such techniques have offered a available and reasonably priced technique of motorized transport, significantly in areas with restricted entry to extra advanced automobiles.