I'm running Maxxis 6006 tires on my 2005 XR650R generally I like everything about them except that the front tire is half an inch narrower than advertised and seems really skinny. Someone on the Yahoo XR650R site said that skinny tires dont grab ruts, I have TWO mountain bike tires that are fatter than the Maxxis 6006 and the whole point is that they go over rougher terrain better, rocks, roots, bumps, you name it, if it's nasty a fat front tire will just bash over the top of it while a thin tire gets knocked sideways. So is anybody out there running fat front tires on their dirt bikes? If not why not? There HAS to be some sand riders who have fat sand tires on the front. How fat of tires can you run on the XR650R? Anybody out there put an 18" rim on the front of the bike? Does anybody make a really fat 21 inch dirt or gravel road tire?