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Cranks vary greatly dependant on the purpose they have been designed for, Track, BMX or bikes with internal rear hubs consist of a single chainring whereas bikes designed for Road or Mountain use consist of two or three chainrings. There are several main components that make up a crankset, the drive-side crank arm which typically has an integrated spider and replaceable chainring, the left crank arm and bottom bracket components. Cranks are typically sold inclusive of the drive-side crank arm, chainring/s and left crank arm, bottom brackets and spindles are typically sold separately.