175 lbs, southern Indiana, dirt, mud, rocks, roots ruts. Still have the crappy OEM tire up front and a pretty fresh Dunlop 606 on back. I'm running 16.5 up fron and 20 in back, which is the way the dealer had it. I've never chainged. Any suggestions. I can re-inflates when i need to hit the road, which I don't do much of.