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What size is the standard wheel and tire combo on the Impala SS?

April 26, 2017Combo impala size SS standard tire wheel

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What size is the standard wheel and tire combo on the Impala SS?

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The standard tires are BFGoodrich Comp T/A ZR4s in the P255-50ZR17 size. Currently, BFGoodrich is the only company to make a tire in this size. Several tires are available in similar sizes, but the speedometer will then be off. The B body cars have a 5″, 5-bolt stud pattern, while ALL Corvettes (and most other sports cars) have a 4 3/4″ 5-bolt pattern. Keep this in mind when purchasing aftermarket wheels or drooling over those 315 series tires on the ‘Vette. The stock 255/50 17’s are 27.0394″ in diameter (the height of the tire itself, or the height of the aspect ratio, is 5.0197″) And finally, the magic formula: Rim Size[in] + (((Width[mm] * (AspectRatio / 100)) * 0.03937)*2) e.g.: 17 + (((255 * (50/100)) * 0.03937) * 2) 17 + (((127.5) * 0.03937) * 2) 17 + ((5.0197) * 2) 17 + 10.0394 ———— 27.0394″ for the stock setup. Back to the index…