I know this is an old thread but it is the most relevant thread I can find on here so I am bringing it back up.
Anyway, I have 42 Iroks and they suck IMO. Mine are roughly 90% tread and no matter what pressure I run, I can't seem to make the same hills (as easy) as my old 39.5" cut TSL's. Terrain I run most often has very little rock, alot of hill climbs, and unfortunately, mud holes at the bottom of those hills. I haven't been to Tennessee with these tires yet, so maybe there they will be good. However, since I get down there about 6-8 times a year, I need a tire that works locally.
Has anyone on here grooved them and had positive results?