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      03-08-2013, 10:08 AM   #9
ortho281
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Drives: 2011 E92 M3 6MT
Join Date: Aug 2010
Location: Katy, TX

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I would put wheel/tires on car and use tape measure to measure from outer tire to inner lip. Leave yourself a little clearance to avoid rubbing. You can drive car on a incline (i.e. driveway) diagonally and do measurements there.
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