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. We will reply your message within 48 hours. If you do not receive our reply within 48 hours, pls. Post a message again because sometimes our message system may block some emails. If you are satisfied with our service, pls. Our aim is to provide Level Customer Service, your recognition will encourage us greatly and serve you better. We strive to keep all our customers satisfy. We will do our up most to exceed your expectations in customer service, communication and dispatching of your orders.