Products

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.

Our double pitch precision roller chain sprocket is suitable for low speed, low mechanical power, and large sprocket center distance chain drive applications. It is integrally forged using medium carbon steel. Professional gear hobbing machines are adopted for the teeth creating. Our double pitch sprocket wheels are durable and wearing resistant, due to the integral quenching and tempering, as well as the high frequency quenching for the teeth.

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

Double single sprockets are precision machined steel spockets and run with two single chains. They are stocked in minimum plain bore, taper bushed and Martin Split Taper style. The minimum plain bores can be quickly modified for your specific application.