I'll be on road as much as off with my XRR (it's on the truck, should be here next Weds!)What brand/type/size rear tire will hold up best? I'd prefer a tire that was best for trail riding & ok on the street traction wise. But would like to not have to change it weekly. I read pirelli 21's, terraflex 2, & Maxxis IT's, but I think I'll be forced to be on the road more than most.