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      07-05-2013, 01:09 PM   #3
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Drives: BMW
Join Date: Jun 2007
Location: Anaheim, CA

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Garage List
2013 BMW M3  [5.00]
2015 BMW M4  [0.00]
2013 BMW F30  [0.00]
2014 BMW F22  [0.00]
2013 BMW F06  [0.00]
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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