In 1880, Hans Renold, a Swiss engineer based in Manchester invented and patented the "bush roller chain". The rest was history. In the first half of the twentieth century, almost every form of transport depended on roller chains. An exploded view of a link of a bicycle chain Layout of a roller chain 140 years after their invention, the concept of roller chains remains central not just to the bicycle but to the transmission of machines used in a plethora of industries across