(11-12-2017 12:56 AM)Cormanus Wrote: It's always going to be less that 90º, isn't it, unless you're leaning backwards?

Can you explain? I have always taken the hip angle to be the angle between the line formed by the front of the body and the line formed by the front of the thigh. Why did I assume this? Because it makes sense to be interested in that angle. It would be one measure of how folded up your legs are and the knee angle would be another.

But I realize now I was wrong as the illustrations clearly show this angle being greater than 90°.

So what is the hip angle? I thought it might be the angle between the back and the back of the thigh but that doesn't match the drawings either.

alprider - I took your suggestions and played around with seat position and legs on a cruiser and a sportbike and still don't get it. Can you just come out and tell me what this angle represents?