Does what it says on the tin. I run them with newer stock wheels and a 275/60r20 tire in stock height z71. I haven't rubbed it before, but rub the spacers. I will take a little less than 275 / 55r20. I cranked my t-bars and it still works. Standard wheels do not rub (265/70r17). 275 sticks out, maybe a little too far for my liking, but not by much. See photos. The last photo shows a standard 265 tire and wheel, and it's barely protruding from under the fender. Even on new wheels, the spacer can