I normally run the Dunlop Geomax AT81which a great long lasting tire (900 miles easy)
I though I would try the IRC after reading a review where it was the best soft terrain tire.
Well after 60 miles off road in lots of deep sand and hard pack, pushing as hard as my WR250R would let me, I'd say this is the best off road tire I've had in deep sand - it felt like I had paddles which I guess is no surprise as the these are biggest knobs I've ever seen. Only down side is I can see a lot of wear even in the little riding I've done - I hope I can get at least 500miles out of them.
Note: I got a 130 width and it is less wide than most 120's I've used.
I have been riding desert, dual sport, tight trails, etc and tried most brands and types of tires and with a tubeless system this tire has been a favorite as of lately. Starting to wear the sipes out of the tires after about 200 miles of normal riding (not race pace) but the tires work great and I would expect them to wear when running low pressures. Do not know how they would work at a normal pressure but am extremely happy with them and my setup. Have not ridden in sticky mud yet but the pattern looks like it will self clean. Throws some good rocks at anyone behind me. Go tubeless and smile with this tire. I only hope the price stays where it is at now.
This tire came stock on my KTM 350 EXC-F. I only ride on the street if I have to, and with only 40 street miles on the tires there was already very noticeable wear. I've punished them in the dirt and they are holding up well. Traction has been excellent and I'm very happy with performance in all conditions.. dry, gravel, mud, hardpack, etc. They are great climbers too. I just wish the knobs could be a little taller when new but I guess they need to stick to the regulations. I'm happy with the tire overall but I can almost hear them wearing down while on the pavement.