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The crankset (in the US) or chainset (in the UK), is the component of a bicycle 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. It consists of one or more sprockets, also called chainrings[1][2][3] or chainwheels[3] attached to the cranks, arms,[4] or crankarms[5] to which the pedals attach. It is connected to the rider by the pedals, to the bicycle frame by the bottom bracket, and to the rear sprocket, cassette or freewheel via the chain.

A Shimano 105 crankset with two chainrings on a road bicycle
A Shimano Deore right crankset, showing crank arm, spider, three chainrings and chainring guard
Belt-drive crankset on a Trek District

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