A sprocket, sprocket-wheel, or chainwheel is a profiled wheel with teeth, or machine gear-pieces, that network with a chain, track, or other punctured or indented material. The name 'sprocket' applies by and large to any wheel whereupon spiral projections draw in a chain disregarding it. The sprocket is a very basic part of the transmission of energy and development in most bicycles; they exist in various estimations, teeth number and are made of different materials. All around sprockets are made of smooth steel.