I don't know how the newer S12 Michelins are, but I stopped using them a few years ago after they started making them in Thailand out of junk rubber. I always liked the Pirelli Scorpion Pro, and Trellborgs were my favorite when WER was importing them. Never tried a Maxxis SI. Basically local stuff here is like New England, all rocks, some mud and roots. Hard rubber compounds suck big time. Thats why the trials rear works so well. That radial Maxxis knobby sounds like it might be the bomb but can't find it anywhere, must be too new.