P-Metric System

The P-metric system is used internationally and requires both English and metric measurements to describe tire size, construction and performance. This designation is employed on tires for newer vehicles. The designation is composed of three letters and three numbers to signify (in this order):

The above information is found on the tire sidewall. For example, a P235/60VR15 tire would be a passenger car tire 235 millimeters wide (sidewall-to-sidewall) with 60% profile and maximum tire speed of 165 mph using radial construction for a 15" diameter wheel.

TIRE PROFILE

NOTE: Some tires may have a separate Service Description instead of a speed rating. The Service Description would be composed of a load index and speed symbol. If a tire has a "V" speed rating in the Service Description, the maximum limit is 149 mph. Speed ratings do not and should not be interpreted to mean the vehicle can be safely driven at that speed. Most roads, traffic conditions, weather, vehicle traits and driver reflexes all support driving at or below the legal speed limit.

Additionally, the sidewall would state the


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