Bike fitting: Crank length

[Cycle_Fit]

The decision on crank arm length is often an over looked factor in bicycle setup. When purchasing a new bicycle, crank length is never really considered, however, it can make a significant difference to your overall cycling performance and pedal efficiency.

 

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[Lookout v2]

I don't know, if you see the hip joint as the pivot point, then 5mm variance in crank length vs the variance of 100mm in Femur length seems trivial for different rider lengths. The taller guy would normally also have longer feet, that displaces his ancle joint (the other pivot) further away from the pedal center point.