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I can't answer your question, but FWIW I have 20s with Pirelli PZero runflats (not by choice; bought the car off the lot) and the ride is not bad at all. I was really expecting a harsh ride, but I'm pretty impressed. That said, I will probably look for 19s when these tires wear out; probably on stock BMW 19" rims.
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Mine: 2019 Mini Cooper S / Moonwalk Grey / Black Interior
Wife's: 2018 X2 XDrive 28i / MSport X / Mediterrean Blue / Mocha Dakota Leather
Previous: 2008 E92; 2014 F30; 2016 F30 M Sport; 2011 E82 (Man I miss the 1er!)
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