I think that they would discourage the use of a 275 on an 8 1/2" wheel. Will it fit? Yes, but the sidewalls would probably "pooch" out and be too flexible for good handling. I believe that they say you need at least a 9" wheel for the 275's. For the 8 1/2" wheels 245/45 would be the standard as they are about the same diameter as the 275/40's
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