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I think what thijs-v-d-H was referring to is not the actual diameter of the overall tire but rather the rim. The smaller the rim for the same size tire, the more sidewall you have and the better the traction in deep snow.
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2009 750i individual | Citrin Black Metallic | Platinum Merino Extended Leather | BMW Individual Composition Package (includes Sport Package) | Dynamic Handling Package | Multimedia Package | Technology Package | Executive Package
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