I am 6'4", 260 lbs and have a new KDX220R. The bike is good stock if you are a novice (like me). I have had the bike for about three months mostly ride trails and I really enjoy the bike. It has plenty of power for me, but I am getting ready to order heavier (.48 kg) race-tech fork and a heavier race-tech (5.6 kg) shock springs on the bike, and well as the tall seat foam (ceet brand). Follow the guidance in the tips for tall riders section. Search through the site, there's plenty of good advice for slim, trim 260 lb. guys like myself and your friend.