Uniform Tire Quality; (Utqgs); Uniform Tire Quality Grading - Toyota 2016 Yaris Owner's Manual

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7-6. Uniform Tire Quality Grading System (UTQGS)

Uniform Tire Quality Grading System

This information relates to the tire grading system developed by the

U.S. National Highway Traffic Safety Administration for grading tires

by tread wear, traction, and temperature performance.

The tread wear grade is a comparative rating based on the wear rate

of the tire when tested under controlled conditions on a specified gov-

ernment test course.

For example, a tire graded 150 would wear one-and-a-half times as

well on the government course as a tire graded 100.

The relative performance of tires depends upon the actual conditions

of their use, however, and may depart significantly from the norm

because of variations in driving habits, service practices and differ-

ences in road characteristics and climate.

Traction-AA, A, B, C

The traction grades, from highest to lowest, are AA, A, B, and C.

These grades represent the tire's ability to stop on wet pavement as

measured under controlled conditions on specified government test

surfaces of asphalt and concrete. A tire marked C may have poor

traction performance.

The traction grade assigned to this tire is based on braking (straight

ahead) traction tests and does not include acceleration cornering (turn-

ing), hydroplaning, or peak traction characteristics.

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