The manufacturers grade the tires themselves for temperature, traction, and treadwear. The system has been essentially unchanged for decades, despite significant advances in tire engineering.

Tires with a 60,000-mile treadwear warranty and UTQG Treadwear grade of 580 in specific 17- and 18-inch tire sizes will have a free replacement cost between up to 30,000 miles.

Likewise, a tire with a 700 UTQG grade and an 80,000-mile warranty had excellent tread wear in the tests. Most Read Life Stories Here are the things you do on a plane that you’ll regret ...

UTQG ratings for Treadwear, ... Uniform Treadwear Quality Grades are what separate a tire from being legal for series such as the 24 Hours of LeMons (190-treadwear minimum) or not.

WASHINGTON (July 4, 2000)—The federal government is changing the way it calculates treadwear grades under the Uniform Tire Quality Grading System. In a final rule, effective July 24, the National ...

WASHINGTON—The federal government is changing the way it calculates treadwear grades under the Uniform Tire Quality Grading System to keep a lid on increases in treadwear grades. In a final rule, ...