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      07-05-2013, 01:09 PM   #3
VMRWheels
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Drives: BMW
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The middle value is a percentage of the width, so they are meant to be different profiles considering the rear is wider. The goal is to keep the height as close as you can between the front and rear tires. Your stocks should have been 225/40/18 though, as MonacoBlueE90 pointed out.
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