I use a trials tire on a regular basis too, it's awesome but some guys just don't like them. Their loss.
Steve,
No offense, but I would never recommend the S12 for rocky terrain. Especially the stuff around Spokane, WA. We use the S12 up here, but it gets trashed in the rocks. Traction is great, but after a 3 hour hare scramble it is absolutely toast (mind you this is with my friend who is a AA racer using it. I only use an S12 in the soft stuff since it chunks so easily in the rocks). This experience is with the 130/80-18 and 140/80-18 tires.
If you want a knobby tire that lasts, the Maxxis IT is definitely one of the best. After the Rock Pile Enduro last week in Montana my IT rear tire barely looks worn. In fact, I'm using it again this weekend for the Canadian Enduro Championship races!
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