If your rear is 18x9+30 (no spacers) then I believe the biggest tire you could fit would be 275/35-18 with no major fender work (just a roll, maybe slight pull) and 0 camber. In the front you really want as much inner clearance as you can get if you plan on using knuckles, but you could go with anywhere from 225/40 to 265/35 depending on a lot of things like camber, offset, etc. If you want 265s in the front, then you should probably get wider fenders.
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