A sprocket[1] or sprocket-wheel[2] is a profiled wheel with the teeth, or cogs,[3][4] that mesh with a chain, monitor or other perforated or indented materials.[5][6] The name ‘sprocket’ applies generally to any wheel where radial projections engage a chain moving over it. It really is distinguished from a equipment in that sprockets are never meshed together directly, and differs from a pulley for the reason that sprockets have tooth and pulleys are easy.

Sprockets are found in bicycles, motorcycles, cars, tracked vehicles, and other machinery either to transmit rotary movement between two shafts where gears are unsuitable or to impart linear movement to a track, tape etc. Maybe the most typical form of sprocket could be within the bicycle, where the pedal shaft bears a sizable chain sprocket sprocket-wheel, which drives a chain, which, in turn, drives a little sprocket on the axle of the rear wheel. Early automobiles were also largely powered by sprocket and chain mechanism, a practice mainly copied from bicycles.

Sprockets are of varied designs, a maximum of efficiency being claimed for each by the originator. Sprockets typically don’t have a flange. Some sprockets used with timing belts have flanges to keep carefully the timing belt centered. Sprockets and chains are also used for power transmission from one shaft to another where slippage is not admissible, sprocket chains getting used instead of belts or ropes and sprocket-wheels instead of pulleys. They may be run at high speed plus some types of chain are so built as to be noiseless actually at high speed.