Original tire size 68 Valiant
Not sure A78-13?
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175/80-13
The modern metric equivalent to tire size A78-13 is a
175/80-13
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This size is available in load range B, rated for 1,100 pounds at 35 psi, and load range C, rated for 1,360 pounds at 50 psi
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The replacement size for the A78x13ST original tire is the ST175/80-13, with an overall diameter of 24.1 inches and an overall width of 7 inches
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