Interesting. He's saying he found better power power and endurance he went with a 175mm crank and he's recommending it to most of his customers. Then I did the 18% femur to floor measurement and came closer to 170mm. Then he says there probably is no perfect length crank, and he has plenty of customers that ride different length cranks on different bike and are happy with all of them. I think I'll probably find a few bikes to ride with different length cranks just to see if I can even tell a difference.