FWIW, I can't imagine going bigger than 265-60-18 after installing the Borbet's and Yokohama's. The tires stick just far enough outside the wheel wells to give it that aggressive look, and any wider would have almost certainly required more significant trimming and probably beating the back of the wheel well with a BFH. What's odd is that they appear to stick out just as much as the 285's that others here run, which leads me to believe that maybe the Borbet rims have a larger backspacing/offset? I dunno...

I imagine you'd be happy with anything 265 or larger.