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Check out the entire stock of high quality and durable Mini bike #40 engine sprockets at OMB Warehouse, good as OEM replacement parts and sourced from leading brands. Engine sprockets are a key component of mini bike transmission and play a crucial role in the overall performance of the machine. The countershaft sprocket grips the motorcycle’s chain and begins to turn the chain. The chain grips the wheel sprocket and turns the motorcycle’s engine power into forward momentum by turning the wheel. The sprocket is thus a vital component of any mini bike. You can gear up by using a smaller rear sprocket or a larger countershaft/front sprocket. Gearing up adds more speed and decreases the final drive ratio. You can gear down by using a larger rear sprocket or a smaller front sprocket. Gearing down reduces speed and increases the final drive ratio. One of the top selling items in our inventory is the 40T 40 Teeth 428 Chain Rear Sprocket Cog for 150cc 250cc ATV Pit Dirt Bike. The diameter of center hole is approx. 37mm, the overall diameter of the sprocket is approx. 165mm 40 Teeth Rear Sprocket. These Mini bike #40 engine sprockets are made of high quality and very durable materials.