My primary ride is a big black 2008 DRZ400s. It sees very little pavement (less than 10%). Off road, I ride the sandy/rocky trails of Colorado with a group of younger guys on much more dirt-capable mounts (KTM EXCs, CRF450Xs, Husky TEs, WRF450s...) I ride it in places and in a manner that it was never designed to handle, but somehow, I manage to go just about anywhere I need to ride at a pace that 340lb (with gasoline, accessories and tools) should not be ridden. My problem is that I cannot seem to get more than 5 outings out of a rear tire. I used to run D606s -- great traction, but never good for more than 6 rides.Last year, I switched to Pirelli Scorpions. Same thing. Five 80-mile rides off road and the rear tire is ready to be replaced. I'm running higher pressures (25lb) and that doesn't seem to help. These rocks just tear up the knobs...So, I am considering either going to a Michelin T63 or even a trials tire. Any suggestions from this groupo? I'm tired of replacing rear tires twice a season. Thanks for your advice.