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Constructed of the highest quality 1045 high-carbon steel with an exclusive heat treatment for added strength and wear resistance. Most are zinc plated and have a baked on durable paint process for corrosion resistance. This is the strongest, longest lasting steel replacement sprocket available. Nearly all motorcycles come equipped from the factory with this sprocket.

Riding a bike with worn out chain set is driving a bike with less power and less mileage, because a worn out chain set decreases the power to a extent of 10% and mileage is decreased up to 5 to 8 kilometers/L .

12 tooth freewheel for bike. Mainly used to refit your bike. Color:copper. Material:metal. Tooth number:12 tooth. Aperture:approximately 18 ¡À 0.02mm. Whether it can be rotated reversely:No. Package includes: 1 x Gear​

Be sure to measure your chain or current sprocket before ordering. 420 chain has 1/2" pitch and 5/16" roller diameter. Most Chinese sprockets have the chain size and teeth count stamped into the metal.

Sprockets are of various designs, a maximum of efficiency being claimed for each by its originator. Sprockets and chains are also used for power transmission from one shaft to another where slippage is not admissible, sprocket chains being used instead of belts or ropes and sprocket-wheels instead of pulleys. They can be run at high speed and some forms of chain are so constructed as to be noiseless even at high speed.

Sprocket processing: forging, machining, hobbing, treatment on quenching, surface treatment/rust-proof treatment