The kit is suitable for almost all unmodified 2-stroke regular bike engines and allows users to use the bike’s standard rear chain shifter to change speed. Jackshaft kit for gasoline electric bicycle refit accessories. Low noise, just like a regular bike with pedals. Comes with all needed accessories for easy installation. You can enjoy a faster ride. Item Type: Motorized Bike Jackshaft Kit Material: metal Color: as picture shown. 1 x Chain Ring Protective Cover. 2 x Chain Ring. 1 x Iron Plate. 2 x Center Shaft. 2 x Center Shaft Guard Board. 3 x Accessories Bag. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.