How to Measure a Crankset

Cyclists focus their efforts on buying a bike with a proper fit. They usually focus on the frame size, stem length and handlebar width, but rarely is the size of the crankset considered. Most crankarms are between 165 and 175 mm long, while some measure as long as 180 mm. Taller riders tend to prefer longer cranks, which neutralizes their pedaling cadence. Shorter cranks reduce the possibility of catching a pedal on an obstacle, while longer cranks allow a rider to plant their outside foot closer to the ground, lowering the center of gravity when tackling corners.

Things You'll Need

  • Tape measure
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Instructions

    • 1

      Place your bike on a work stand or lean it on a solid surface, keeping it secure and prevented from moving.

    • 2

      Locate your bike's crankset assembly. It is on the right side of your bike and holds the pedal on one end and the front chainrings at the middle.

    • 3

      Place your tape measure along the edge of the crank arm. Measure the distance from the center of the pedal to the center of the bottom bracket; it is a center-to-center measurement. The size of your crank arm measures this distance, as opposed to the overall length of the crank, because this distance determines the size of the circle you pedal.