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I would recommend fitting 8.0 x 18" rims all around and 225/45/r18 tires as well. The reason is that in winter, you want a narrower tire that can cut through the snow and slush to give you traction. If you have a 255 in the rear, it is great for summer (not as much for heavy rain) but won't cut into snow as well for winter. You can also rotate them to get an extra season out of your winter tire set. This is what Tire Rack recommended (BMW recommends 225's but a 17" diameter, but 18" is sportier).
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