The problem is likely crappy tires and not "run flat" tires. Only assuming since when anybody says "run flat" I guess we're all supposed to know what brand, model and size tire they mean???
Perhaps evaluate what you're trying to accomplish. 20" tires have every possibility of being worse than "run flat" tires depending on the brand, model and size . . .
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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim
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