This is a very funny discussion. Lots of people have changed from runflats to non runflats with no problems on their all wheel drive BMWs. My brother-in-law has run Michelin CrossClimate SUVs on his X5 for the last 50K miles with no problems. Obviously they are not star spec but they are the same size as stock tires.
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BMWCCA member Puget Sound Chapter
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