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1969 912 Tire sizes-selections

Wheels and Tires

Vehicle Information: Model: 912; Year: 1969; Body Type: Coupe; Engine (type, size, modifications): 1720 cc Porsche; Total Mileage: 78,000;

I need information on tire sizes. My race based mechanic suggests going with 165 fronts and 185-195 rears for all/round driving performance. This still leaves questions about aspect ratios, speed rating, treadmatching and brands. The rears are readily available, however the 165s are limited, and hard to match the rear.I now have 185/65x15, which throws my speedo 10mph off. I want to get back to the correct speedo reading, and use the car occationally (less than 2000mi/yr), and enjoy the performance potential learned during our recent PCA-SD driving school. What are your suggestions, and sources?

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