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Snow tire sizes

Wheels and Tires

Vehicle Information: Year: 2003; Engine (type, size, modifications): Boxer, 3.2, not modified; Total Mileage: 9000; Transmission: Manual;

Will there be a noticeable difference in winter performance between rear 225/45 R17 (8.5 inch rims) versus 255/40 R17 (9 inch rims) Dunlop Winter Sport M2 snow tires? The former can be supplied by Porsche and I realize are preferable being narrower, the latter by Tire Rack and are cheaper. The difference for a set of 4 wheels and tires (differing in the rear sizes as described above) is $400. Does this justify the extra benefit of the narrower rear size?

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