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I did some research and if I am looking at it right, since it's an 18" wheel and I want to lower with Steeda springs, to fill in the wheel well I would be better off with the 255/45? Is that a true statement?
the numbers mean 45 is the percent of the width that equals the sidewall
so 255*45%=114mm is the side wall
and 275*35%=96mm so the difference is 2cm in radius or 4cm diameter