Ok, I see what you mean. I didn't know if he was saying the location of the crank hanger could be different or not. So, this might be one reason that people talk about changing crank sets?

The reason his commentary caught my ear is that I know of several people who complain that biking hurts their knee or knees when running or hiking doesn't. I know there are a lot of causes of knee issues in our world, but I was kind of brought up to believe biking was good for your knees.