This form of chain drive is made from a series of cylindrical rollers fastened together with side links. ... For relatively low-speed and minimal wear applications, such as in transmitting motion from a hand-operated lever or foot-operated pedals like on a bicycle, simplex roller chains are generally sufficient.
A roller chain is a mechanical device that transmits power from a motor to a driven shaft. It's made up of a series of rollers and links that move around a sprocket. Roller chains are used in many types of machinery, including cars, bicycles, and industrial conveyors.