Uniform Tire Quality Grade Standards (UTQG) were originated to provide consumers with useful information to help them purchase tires based on their relative treadwear, traction and temperature capabilities.
Treadwear Grades
UTQG Treadwear Grades are based on actual road use in which the test tire is run in a vehicle convoy along with standardized Course Monitoring Tires. A grade of 100 would indicate that the tire tread would last as long as the test tire, 200 would indicate the tread would last twice as long, 300 would indicate three times as long. Treadwear Grades of tire lines can only compare within a single brand.
Traction Grades
UTQG Traction Grades are based on the tire’s straight line wet coefficient of traction as the tire skids across the specified test surfaces. The UTQG traction test does not evaluate dry braking, dry cornering, wet cornering, or high speed hydroplaning resistance. Traction Grades measure the tire’s coefficient of friction (braking g forces). It places more emphasis on the tire’s tread compound and less emphasis on its tread design.
Grades:AA
Asphaltg-Force: Above 0.54 Concreteg-Force: 0.41
Grades:A
Asphaltg-Force: Above 0.47 Concreteg-Force: 0.35
Grades:B
Asphaltg-Force: Above 0.38 Concreteg-Force: 0.26
Grades:C
Asphaltg-Force: Less Than 0.38 Concreteg-Force: 0.26
Temperature (Resistance) Grades
The UTQG Temperature Grade indicates the extent to which heat is generated and/or dissipated by a tire. The grade is established by measuring a loaded tire’s ability to operate at high speeds without failure by running an inflated test tire against a large diameter high-speed laboratory test wheel. This laboratory test is similar in nature to those used to confirm a tire’s speed ratings. Temperature Grades Speeds in mph
Grades:A
Speeds in mph: Over 115
Grades:B
Speeds in mph: Between 100 to 115
Grades:C
Speeds in mph: Between 85 to 100
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