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Tire ratings

Wheels and Tires

Vehicle Information: Year: 2002; Body Type: Cabriolet; Total Mileage: 8500;

I've searched the previous posts and can't find the answers: What is the difference in the "N" tire ratings from Porsche, i.e. the difference between N0, N1, N4 etc? Also, TireRack has good ratings on the S03's. Why are the S02's N rated but not the 03's? Too new? Might they receive an N rating in the future or have they already been tested and denied the rating?

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