Uniform Tire Quality Grading System (UTQGS); Uniform Tire Quality; Uniform Tire Quality Grading- Page 567

Uniform Tire Quality

Grading System (UTQGS)

▼

Uniform Tire Quality Grading

System (UTQGS)

This information relates to the tire

grading system developed by the U.S.

National Highway Tra

ffi

c Safety

Administration for grading tires by

tread wear, traction, and temperature

performance.

▼

Tread Wear

The tread wear grade is a comparative

rating based on the wear rate of the

tire when tested under controlled

conditions on a speci

fi

ed government

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

signi

fi

cantly from the norm because of

variations in driving habits, service

practices and di

ff

erences 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

speci

fi

ed government test surfaces of

asphalt and concrete. A tire marked C

may have poor traction performance.

WARNING

The traction grade assigned to this tire

is based on braking (straight ahead)

traction tests and does not include

acceleration cornering (turning),

hydroplaning, or peak traction

characteristics.

▼

Temperature-A, B, C

The temperature grades A (the

highest), B, and C, represent the tire's

resistance to the generation of heat

and its ability to dissipate heat when

tested under controlled conditions on

a speci

fi

ed indoor laboratory test

wheel.

Sustained high temperature can cause

the material of the tire to degenerate

and reduce tire life, and excessive

temperatures can lead to sudden tire

failure.

Grade C corresponds to a level of

performance which all passenger

vehicle tires must meet under the

Federal Motor Vehicle Safety Standard

No. 109. Grades B and A represent

higher levels of performance on the

laboratory test wheel than the

minimum required by law.

Customer Information and Reporting Safety Defects

Uniform Tire Quality Grading System (UTQGS)

8-21

Mazda3_8JM2-EA

-

20H_Edition1_new

2020-7-10 17:21:34