Roller chain or bush roller chain is the kind of chain drive mostly used for tranny of mechanical power on many kinds of domestic, commercial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, vehicles, motorcycles, and bicycles. It contains a series of brief cylindrical rollers held together by aspect links. It is powered by a toothed wheel known as a sprocket. It is a straightforward, reliable, and efficient[1] method of power transmission.

Though Hans Renold is credited with Drive Chain inventing the roller chain in 1880, sketches by Leonardo da Vinci in the 16th century show a chain with a roller bearing.