What Are the Benefits/fallouts of Various Crank Arm Length for a Road Bike?

Published July 10, 2010

Question by Jie C: What are the benefits/fallouts of various crank arm length for a road bike?
I currently ride a crank that is 170mm in length. I found a group online that is highly attractive, but that crank length arm is 175mm.

My question is, what’s the difference in the different length or crank arms? I see some at 170mm, 172.5mm, 175mm. What would compel one person to go for a longer or shorter crank? Thanks.

Best answer:

Answer by Bob A
The right crank length will depend on you riding style and the length of your legs. Here is a crank length calculator.

http://www.machinehead-software.co.uk/bike/cranks/cyclist_crank_length_calculator.html

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