Quote Originally Posted by indysteel View Post
So, as a starting place, you might want to identify what's different between your bikes' respective geometries to see if that provides some guidance as to why one is comfortable and one isn't.
I was thinking this too. Particulalry if you find the pain is only a big issue on longer rides for one bike (meaning that your personal conditioning is likely not a problem). It's amazing how many tiny fit/geometry issues can pop up when you've been on a bike for a long time that might not be there for a 2 hour ride. I have two bikes that are now set up with identical positioning for me (even though the bike geometries are different), but for a long while, I could only stand 3+hr rides on one of them.