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According to Tirerack.com, the recommended wheel width for the factory 20" tires is:
245/45ZR20 = 7.5 - 9.0 inch
275/40ZR20 = 9.0 - 11.0 inch
Personally, I don't think I would stretch that 275/40 on a 11" wheel, but I've seen plenty of people put them on a 10" wheel just fine. You will be fine with the stock 245/45 on a 8.5 inch rim.
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