I think I have found the limit for stock suspension. I went with a 255/65r17 and they just clear the a-arms in the front. Took it for a decent drive, lots of turns in a big parking lot. It might rub if I were wheeling, but I've got other toys for that. Anyway, I was nervous at first I had ordered too big and would need to go Truxx lift, but was grateful when it all worked out. And it finally looks like a truck!