I've been running Pirelli MT18 Heavy Duty DOT tires front and rear on my WR426 for the last 2 months and they are lightyears better than the Dunlop 606's they replaced. They don't have quite the street manners of the Dunlop's but have plenty of grip for aggressive street riding and better road wear than the Dunlops. The only wear I can see after a few hundred miles of hard street use if some rounded edges on the knobs. Off-Road: These hook up great on everything but sloppy mud. Had them on some muddy trails last weekend and they did pretty good but did pack up if you didn't keep the rear wheels aggressively spinning to clean it out. Front tire solved the washing out problem that I had with the Dunlop 606's, it is much more aggressive. Rear hooks up on any hardpack or loam. These tires are tough. I have ridden them through some really nasty rocks and roots and they have not been phased at all. No chunking at all. I feel very confident that they will never give me any pinch flats. I read one guys review saying that he got a flat tire on his rear MT18 and the 6 ply carcass is so stiff that he road the rest of the way back and it handled it just fine with no air.