Im looking at a 15.5" Mullet for my 13 y/o as a XC/Trail bike. He won't be using it to DJ. He has had his mom's 15" Reign on loan while she was pregnant. She is now back to riding and wants it back. He has been climbing fine with the Reign and pushing around the 30 lbs with no problem. I'm not sure how much the Mullet weighs. The one I'm looking at is on CL and has some great components. How do they to as XC bikes?