With under-powered bikes, a close box is more important.I rode a friend's XR12. Good suspension and brakes, nice, neutral handling, but seemed to run out of breath. I may be spoiled by bikes with high horsepower. Numbers on my last 3 main riders; 132, 170, 155. I believe the XR has Buell-spec heads and cams, so there may be some unlocked potential therein.