Roller chain or bush roller chain is the type of chain drive mostly used for tranny of mechanical power on many types of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing Transmission Chain devices, printing presses, cars, motorcycles, and bicycles. It contains a series of brief cylindrical rollers held jointly by side links. It is powered by a toothed wheel called a sprocket. It is a simple, reliable, and efficient means of power transmission.
Though Hans Renold is credited with inventing the roller chain in 1880, sketches by Leonardo da Vinci in the 16th century show a chain with a roller bearing.