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      06-17-2012, 03:02 PM   #4
bmw325i
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Drives: 2006 BMW 325i
Join Date: Oct 2010
Location: United States

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The calculator is right, think about it this way the larger diameter tire would cover more distance in one rotation than a smaller tire. I wouldn't worry about it though in fact your speedometer will be more accurate with the larger tires.

What I would worry about is traction with the 225's in the back I don't know whether or not that would be a problem