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you can even go to +35 with no problems. i am running +40 with 235's all around and no problems. theres about a finger gap (vertically) between the tire and rear fender, so theres plenty of space.
225/40/18 is fine, I have 245/40/18 and it causes rubbing when I make hard turns, keep in mind I am running +38s. 245 gives me extra protection also since I live in NYC, you should know.