i wear out the rear brake on the XR. that and lots of clutch slipping is the ONLY way to ride it around in tight spaces. use it with the front for most stops, too ... the twin discs up front are a little clumsy and grab when the bike gets around walking speed. it'll put you on the ground in a big hurry. the rear brake wont stop the thing on its own, but it definitely stabilizes it and helps it stand up when you're going slow or coming to a stop.