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TECH CENTER - TIRE TEMPERATURE
A tire's temperature grade indicates how well the tire can dissipate heat under test conditions, assuming proper inflation and maintenance of the tire. There are three possible traction grades: A, B, and C. A rating of A is the highest possible temperature grade, while C is the lowest.
Temperature grades are determined in a controlled test environment, where the tire repeatedly undergoes speed tests until it is destroyed. Depending on how long the tire endures these tests, a temperature grade is assigned. A temperature grade of C indicates that the tire meets minimum standards set by the U.S. government.
The Uniform Tire Quality Grading System, or UTQGS, requires tire manufacturers to disclose treadwear, traction, and temperature information for tires they produce. This is designed to help customers decide which tires are most suitable to their needs.