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1989 964 Design 90 wheel numbers

Wheels and Tires

Vehicle Information: Year: 89; Body Type: Coupe; Total Mileage: 144030;

I'd like to know what the numbers on my design 90 style rims mean. On the front set near the valve stem I have 6 then 52 marked. Does this mean a 6 inch wide rim with a 52MM off-set? In the rear I have a 7 with 55 marked in the same place. Does this mean I have a 7 inch wide rim with a 55MM off-set? My owners manual states the rims are 6 inches wide in the front and 8 inches wide in the back. I am getting ready to replace my tires and want to make sure I get the correct size. (I prefer the largest size I can put on these rims safely, without damage to the car or requiring any special modifications).

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