UTQG

What is UTQG?

The UTQG on the sidewall is a general quality grading, which is the abbreviation for Uniform Tire Quality Grading System, classifying tires according to the wear ability, traction and febrile index. All the manufactures are in accordance with provisions of experimental steps. Authorized testing results should be classified and marked on the sidewall by the manufactures. According to US government regulation, all the tires imported to America must have UTQG data.


Treadwear

The testament of tread wear can only be done at government appointed place – locating near St. Angelo, Texas, where there is an express way of 400 miles. All the tested cars are suppose to run across this road to guarantee the same experimental conditions.The depth of pattern is measured in every 1288 miles, so are the compared tires. After 11592 miles, the tested and referential tires will be compared, through which the tires can be classified according to the wear ability.

Abrasion index is indicated by numbers. For instance: if 100 is set as a cardinal number(standard). The abrasion of 100 can be used for 30000 miles, which means the abrasion of 400 can run 30000 *4= 120000 miles. This is just a reference data running on the appointed road. In fact the rate of wear ability is relating to the car's conditions and driving habits.

According to legislation of American UTQG, the abrasion index of summer tire is between 160- 300. The index that is between 160-200 is utility summer tire, between 300 - 540 is all season tire. The wear ability can only be applied under the same brand, not among different brands.

Traction

The traction demonstrates the parking performance on the wet straight road, which is represented by alphabets. For instance: the tire with AA can stop in the short time compared with the tire with C on straight wet ground.

The traction demonstrates the parking performance on the wet straight road, which is represented by alphabets. For instance: the tire with AA can stop in the short time compared with the tire with C on straight wet ground.

TEMPERATURE

Temperaturerefers to the resistant ability of heat producing when tires are tested on the appointed wheels in lab. Continuoushigh temperature will cause tire aging, shorten service life. And overheat will lead to blowing up. Therefore, DOT prescribes that all the tires must meet the federal motor vehicles safetystandard. The 109th of this legislation prescribes that tires must get the “C” grade, which lowest requirement under 136km/h. “B” and “A” grade means the tire is exceeding the DOT's basic demands.

Grade A   over 6:31H       Grade B   5:01H-6:30H       Grade C  3:30H-5:00H