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Originally Posted by TheSt|G
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Explain how a wheel does this?
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Simple - the 18" wheels/non-rft tires are wider and slightly larger overall diameter (larger contact patch), plus the offset makes the track slightly wider as well. Compared to the skinny 17" stock M-Sport wheels and rft tires, the handling and ride are considerably better. Cornering limits are definitely higher with the larger wheels and tires (pretty much the same as what the 135i comes with).