Michelin S-12 Front! Its only a 90/90-21 but it hooks up better than any other tire I have tried in the dirt. Keep the pressure up around 15-16 psi on rocky rides and don't bounce the front wheel off rocks too hard. The S-12 has diamond shaped knobs 1 row from the outside. They seem to grab on everything from soft dirt to rocks, hardpack, grass, and the few random bushes. Its ok on sand, and asphalt. If you do alot of on-road riding, then I would get a tire with bigger knobs. Offroad, this is my #1 choice. I love it because you don't have to worry about the front washing out from trail braking into a corner to getting on the gas for the monster powerslide exit. Just get your weight a little bit forward but nothing too drastic like Johnny Campbell leaning his stomach on the bar pad.