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cause i need new back tires.. but m front are 265/40/18..... so if i wore to put 315/30 or 315/35 it would be noticable and look dumb
No it wouldn't. 265/40/18 is the same height as 315/30/18. The middle is aspect ratio, and is a percentage of the first number. It's not like 30 or 40 are set numbers. They're percents.