Chevrolet 2010 Equinox User Manual download pdf (Page 339)

Vehicle Care 9-61

Uniform Tire Quality

Grading

Quality grades can be found

where applicable on the tire

sidewall between tread shoulder

and maximum section width. For

example:

Treadwear 200 Traction AA

Temperature A

The following information relates

to the system developed by the

United States National Highway

Traffic Safety Administr ation

(NHTSA), which grades tires

by treadwear, traction, and

temperature performance. This

applies only to vehicles sold in

the United States. The grades

are molded on the sidewalls of

most passenger car tires. The

Uniform Tire Quality Grading

(UTQG) system does not apply

to deep tread, winter-type snow

tires, space-saver, or temporary

use spare tires, tires with

nominal rim diameters of

25 to 30 cm (10 to 12 inches),

or to some limited-production

tires.

While the tires available on

General Motors passenger cars

and light trucks may vary with

respect to these grades, they

must also conform to federal

safety requirements and

additional General Motors Tire

Performance Criteria (TPC)

standards.

Treadwear

The treadwear grade is a

comparative rating based on the

wear rate of the tire when tested

under controlled conditions on

a specified government test

course. For example, a tire

graded 150 would wear one and

a half (1.5) 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 due to variations in

driving habits, service practices,

and differences in road

characteristics and climate.

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