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Carrera 4 Wheel Upgrade: Tire Pressure

Wheels and Tires

Vehicle Information: Model: 964 Carrera 4; Year: 1989; Body Type: Coupe; Engine (type, size, modifications): 3.6 stock; Total Mileage: 90000;

I'm back... After browsing the Bentley Technical Data manual for the 964; they recommend 44 psi for 275/35 ZR 17, and 36 psi for 255/50 ZR 17 (p. 44-11). My new rear tires are 255/40 ZR 17. Not sure which is correct. Do we have any tire experts out there that could comment?Dave CooperCanton, MI

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