sprocket

A sprocket is a specialized mechanical component designed specifically for positive engagement with a chain or a toothed belt. This distinguishes it from a standard pulley, which relies on friction to move a smooth belt. The presence of teeth ensures that there is no slippage, making it essential for applications requiring precise timing or high torque transmission. In common usage, the term is most frequently associated with bicycles and motorcycles, though it is equally critical in industrial automation and internal combustion engines. It evokes an image of interlocking metal teeth and rhythmic, mechanical synchronization.