Originally Posted by
carpediemracing
I find longer cranks get some getting used to because you pedal so much slower. Your feet travel at about the same speed, but you're moving them in bigger circles. Math people, pipe up. cdr
This one is actually fairly simple to do, at least from a perspective of distance traveled per revolution, as it's simply two times the radius (the crank length) times pi.
Below is a Python script to calculate the total distance and percent difference from a standard 170mm crank:
Code:
from __future__ import division #3.0 users get out
from math import pi
cranks = input("Cranklength: ")
print "Distance traveled per revolution is %.2f mm" % (2*pi*cranks)
print "This is a %.2f%% difference from a standard 170mm crank" % ((cranks/170)*100)