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For most road riding, we recommend a length between 20.5% and 21.6% of a rider’s inseam. (Inseam is measured in bare feet from the ground up to the top of a level broomstick pulled up firmly into the crotch.) This is based on many years of experience of selling custom cranks. A shorter length is often called for on a mountain bike, cyclocross bike, or Triathlon/TT bike (see below). For most track events, a shorter crank is also advisable.

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