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20" all season tires

Wheels and Tires

Vehicle Information: Model : Cayenne Turbo; Year: 2004; Mileage: 28500;

Michelin has just introduced a new all season tire, in the correct size of 275/40 WR 20, which fits the Cayenne Trubo. This tire, the "Latitude Tour HP" has the same load rating (106)and similar speed rating (W)as the stock Michelin Diamaris tires (Y). However, thus far, the tire does not have the Porsche N0 or N1 designation. My dealer says that this is a perfect tire, and the only reason that it does not have the N0 or N1 designation is that Porsche has just not yet tested this tire. Your thoughts on this as a suitable replacement tire? It has a tread rear rating of 440, versus 220 for the Diamaris, which migh actually provide for more than 13,000 miles of treadlife.

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