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Tire size calculator. The results of this wheel and tire size calculator are based on the mathematical equations of the sizes entered, not the actual tire specs provided by the tire manufacturers.
Tire Size Conversion Chart. While today's P-metric passenger tire sizes have existed since the early 1980's, restoring classic muscle cars and ponycars has kept yesterday's Numeric and Alpha Numeric tires from disappearing. The chart below is intended to help you determine their equivalent P-metric tire sizes.