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I went from 20” run flat (469) to 21” (375) non-run flat on x5 xdrive 35i msport with standard suspension. The ride is the same. If you go 10mm less width on the 21”, there are a lot more choices in tires and prices came down significantly. I’m running 275/35/21 and 315/30/21. You can get these 21” size with Michelin AS3+ set for aroud $1500 a set. My 20” RFT cost at least that much.
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