A sprocket is a profiled wheel with teeth that meshes with a chain, at each side. Sprockets are used in bicycles, motorcycles, cars, tanks, and other machinery either to transmit rotary motion between two shafts where gears are unsuitable or to impart linear motion to a track, tape etc. Cycles In the case of bicycle chains, it's possible to modify the overall gear ratio of the chain drive by varying the diameter (and therefore, the tooth count) of the sprockets on each side of the chain. This i… (More on Sprocket)