I have run with 265/70/17's for a few years now, first with the 2006 Steel and now with the 2009 Air. The Steel could exhibit some rub - rarely. I have not experienced rub with the air in a wide range of settings - both sport and comfort. This is for non-diesel models. For diesels, the intercoolers vent to the front wheel well and 265/65's are the largest.