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21" also cost a bit more (as do the tires) and the ride is a bit more harsh. Also less forgiving when it comes to potholes etc and curb rash given the lower profile tire. I have 21's and no issues.
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2015 ///X5M
2014 ///M6 (traded)
2014 ///M5 (traded)
2011 550i (traded)
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