I'd run a 235 or 245/60R15 on all 4 corners. Running a larger back tire on the same size wheel as the front doesn't look right in my opinion. They end up looking like balloons... throws off the balance of the car... If you are going to run a fatter tire in the rear.... buy a wider wheel for the rear..
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 Current Pontiacs -
1973 Formula SD455 - #'s auto orig paint
1972 Trans Am - 4 speed orig paint
1974 Formula 400 - Ram Air automatic
1966 2+2 convertible - 421 4bbl automatic
1967 Grand Prix - 4 speed orig paint
1967 GTO - 4 speed orig paint 35k orig miles
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