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dont I need more rubber at the back? maybe 265/35? I'm FI
When a tire is wider than a wheel by a good size margin, such as a 265-width mounted on a 8.5" wide wheel, you won't be taking full advantage of the extra rubber because your sidewalls won't be as vertical as they would be--ideal for handling--w/ something like a 245/255 wide tire.
If you did that the sidewall flex would offset any traction benefit of the wider footprint. If you are FI, I would recommend getting aftermarket wheels at least 8.5f and 9.5r and going 245/40f 275/35r