Uniform Tire Quality Grading, or UTQG, is a ratings systems for tires that includes separate testing and grading of temperature, traction and tread wear. Manufacturers conduct the testing, and results are displayed on the sidewall of each tire.
Temperature grading is based on how well a tire resists wear under high temperatures. Traction is measured based on braking performance on both concrete and asphalt surfaces. Tread wear grading relies on comparison to a control tire travelling on the same surface, at the same speed, and for the same distance. Due to the complexity of the factors it evaluates, and the variation among tire brands, the Uniform Tire Quality Grading system is intended as a guide rather than as a definitive rating.