Crankarm length

CRANK LENGTH

See: http://www.mountain-bike-world.com/mountain-bike-sizing

Your crank length should be 18.5% times the distance from the top of your femur to the floor (in bare feet). The top of your femur is 5 – 6” (12 – 15cm) below your hip bone and it moves rearwards when you lift your knee. A quick way to work this out is to measure from your hip to the floor (in bare feet). Take this length and subtract 5 – 6″ (5″ if you are shorter, 6″ if you are taller). Then multiply this distance by 0.185 (18.5%). The resulting value should be your crank length.

What is the best crank length for cycling? One notable study, by J C Martin and W W Spirduso, suggests the optimum crank length for maximal cycling power production (sprinting) is “20 per cent of leg length or 41 per cent of tibia length”. Even though maximum cycling power was significantly affected by crank length, use of the standard 170-mm length cranks should not substantially compromise maximum power in most adults.

BikeDynamics - Bike Fitting Specialists - Crank Arm Lengths

crank lengths should be 9.7% of our height. 5'9 = 170

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One notable study, by J C Martin and W W Spirduso, suggests the optimum crank length for maximal cycling power production (sprinting) is “20 per cent of leg length or 41 per cent of tibia length”. Shimano’s bikefitting.com network

175 - 172.5 = 2.5 mm