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The Extreme DWS are great tires. You will like them.
The manufacturer recommends them on anything from 8.5 to 10.5 inches for 275/45R21. They did the measurements on a 9 inch rim. The concern would be you would have limited hang over on your rim for protecting it from curbs. On the plus sde you would have half inch taller than stock tire. Oddly the 275/50R21 you wanted only say they fit up to 9.5 inch rim and measured on 8.5 inch rim.
Yes, correct that was the concern. The 285/45/21 would have been the perfect compromise, giving both overhang and height. Unfortunately I couldn't wait till next Tuesday for delivery of the Conti Cross Contact sports I was looking at. Either way, it was only 1/2 and inch of hight on both sides (1inch overall) of the rim for height, which is negligible. So far I really like the DWS, the GL seems more stable and planted and I really like the thread design on the tire.
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