Cooper Cobra RWL turned in 215/65/15 on Vision 7" Nitro up front.
Cooper Cobra RWL turned in 245-60/15 on Vision 8" Nitro out Back.
The wheels are knock offs of Welds from Summit. They only come with 4" back space. If the wheels came with (edit smaller not bigger) backspace I could get a 275 on there easy.
But such are the limitations of wanting to keep the car stock and buying readily available inexpensive wheels. I have had a few guys to tell me to run a small spacer and go wider. I don't mind the 245s....