Here's a picture of the inboard clearance at ride height (~2 figer gap) with coilover sleeves. Theres room to go further inboard. I think I measured at one time you could fit 245s under the stock rear arches rolled maybe trimmed and welded if you have the proper offset. I believe some other members here have done that for maximum tire. I think someone here has actually gone wider but I don't recall their username.