PS. Those Iroks come with one bias tire. You can't run, or not suppose to run, on the same axle with a radial.
I talked to Rob, he said 4 radials and 1 brand new radial. all are radials. Yotatough has a set with one bias, but thats not the set I'm talking about. I'm sticking with 37's. I like being able to drive hard and have the peace of mind that i'm not going to break something serious like a output. I'll use my buggy for the bigger tires.