MountianDew, the back support barley reaches the small of my back . However, i've done extremely long trips on mine. What I have found for me is posture. If I just slump on to the bike I will start feeling it in a few hundred miles. What I figured out on my last trip. If I get on the bike and lean forward then slide by butt back against the seat and sit up straight I'm good for well over a 1,000 miles.