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The crankset (also known as a chainset in the UK) of a bicycle is the component of the drivetrain that converts the reciprocating motion of the rider's legs into rotational motion used to drive the chain or belt, which in turn drives the rear wheel. The road-bicycle crankset depicted in this photograph was manufactured by Shimano, with two chainrings and 172.5 mm (6.79 in) cranks.Photograph credit: Petar Milošević