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You are gonna get a bunch of different answers here. I run a Pirelli Scorpion in front (first time and really like it, thanks Agent2) and like Cleonard a Pirelli MT-43 in the rear, which is the hybrid trials tire (first time and love it) but it is not for everybody. The MT 43 does like deep mud or sand very much, but excels over the knobbies in the dry west conditions. It also lasts 3 times as long as the Maxxis desert IT's I used to run.