I owned the same lift and used 265/75r18 on 18" rims obviously with no rubbing issues. hope this helps maby a few others will post up more info soon.New to this forum. I just bought me a 2011 GMC Canyon crew cab 4x4 V8 5.3. And I was looking at getting the Rancho 4" lift. But I was wondering how big of tires can I fit with that lift?