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1992 968 Tire sizes

Wheels and Tires

Vehicle Information: Model(924/944/968): 968; Year: 1992; Body Type: Coupe; Total Mileage: 75,000;

Hi,Do you know what the tire sizes should be for a 1992 Porsche 968 with 17 inch rims?The owners manual lists the tire sizes as:front- 225/45 ZR 17rear- 255/40/ZR 17, which is what is on the car now,however I went to Costco Wholesale to buy new tires and they used an online reference called the MAST Guide which listed the tire sizes as:front- 225/45 ZR 17rear- 245/40/ZR 17.They also stated that the 255/40 ZR 17 tires were not safe for the vehicle and that they would not mount them.

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