NOS88

I think "rules" for crank length are way over rated. There are just too many variables that can't be taken into account by rules. Inseam size; height; length of lower leg relative to upper leg; muscle mass; foot length; do you point toes or pedal with foot flat; how many degrees to you point toes; if you spin at what rate; are you bent over enough to put your lower back muscles fully into each pedal stroke and how does this impact on your spin; what kind of pedals and cleats do you use..... and on it goes. I think there is real value in trying to find people with different crankarm lengths and seeing if you can try 'em out. After having ridden 165's, 170s, and 175s, I find that I'm most comfortable on 172.5. Why? I don't really know. They just feel more natural to me.