My height is 6'-3" with average leg length. I went from 175 cranks on the road for many years to 172.5's when I built my first gravel bike, just for the pedal strike benefits. I liked the cranks and did the same with my new gravel bike for the same reason. They seem nice, but the difference is not life-changing. I may experiment with 170's in the future, when I get a new bike.