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      06-25-2012, 06:33 PM   #6
VMRWheels
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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]
When you bump up or down the tire profile, it'll change the overall diameter of the wheel. It'll throw off your speedometer a bit. I would recommend staying within factory specs especially since you have the Xi. Use http://www.1010tires.com/TireSizeCalculator.asp to help you calculate the overall diameter numbers compared to your factory wheels.
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