Once you find the series of numbers on your tire’s sidewall, use the diagram above and the list below to find the meaning of each number. Metric, or tire type, defines the proper use of the tire.
Automobile tires are described by an alphanumeric tire code (in American English and Canadian English) or tyre code (in British English, Australian English and others), which is generally molded (or moulded) into the sidewall of the tire. This code specifies the dimensions of the tire, and some of its key limitations, such as load-bearing ability, and maximum speed.
Use our tire size tools to calculate specs, speed, gear ratios and more. Browse tires by size, vehicle, or brand and compare prices online all in one place.
Use our tire size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tire. Just type in a metric or standard size tire and click calculate.
What size tire do you have or want to have? Here is a handy guide.
The traditional sizing systems are based on a measurement of the outside diameter of a tire. This would usually be measured in inches (26", 27", etc.) or millimeters (650, 700, etc.).
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Correct Air Pressure. Maintaining correct tire air pressure is an important part of vehicle maintenance. Maintaining tire pressure may seem like a low priority in our busy daily schedules, but keeping the correct air pressure in your tires is an important part of vehicle maintenance, as it helps with:
The two-digit number that usually follows the tire's section width tells us the aspect ratio, or tire profile measurement. In this example, the 45 indicates that the sidewall distance, from the wheel rim to the outside of the tread, is 45% of the section width.
Kumho Tire U.S.A. Inc, 133 Peachtree Street, NE Suite 2800 Atlanta, GA 30303, warrants to the original consumer purchaser that all KUMHO replacement radial tires either directly or through an authorized KUMHO dealer, and which are mounted on cars within the U.S.A., and becomes unserviceable for any reason within the manufacturers control, such tire will be replaced with an equivalent KUMHO tire.