Interesting to hear that the difference between 19s and 20s is "negligible." I have the standard M-sport 19s and while ride quality is quite comfortable, cornering could be a tad bit better. And, aesthetically speaking, 19s don't make sense on an X5 :P
Thinking of either switching to M-sport 20s or 599m 21s (599m looks the nicest IMO but concerned about a harsh ride quality).
Opinions?
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