What are all those numbers in tire sizes?

Though they look completely random, tire sizes are actually very specific combinations of letters and numbers. Individually, those letters and numbers represent key aspects of the tire—intended purpose, dimensions, load capacity and high temperature/high speed durability. Knowing the appropriate tire sizes for your vehicle will assure that all of the above is in check. And it goes without saying that an incorrectly sized tire on your vehicle can lead to safety and performance issues. For a complete breakdown of the numbers within tire sizes, click here.

While today's P-metric tire sizes have been around since the 1980's, classic muscle cars and ponycars often use the old Numeric and Alpha Numeric tire size systems. We put together a chart that will help you decipher these tire sizes based on today's P-metric system. (Read more.)

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