These are 33x10.5x15 that I bought from Colin some years ago. The Taco wheels got "opened up" in the centers so they would fit over the manual hubs on our 4Runners. I haven't measured the tread, but I'd estimate it to be 5/32 center to 7/32 outside. There's still some life left, specially for just riding around. (I just replaced them with some new KM2s) HURRY, I'm trying to raise some dough to buy a quad.