Chevrolet TRACKER 1997 Owner's Manual download pdf (Page 283)

Uniform Tire

Quality

Grading

The following information relates to the system

developed by the United States National Highway

Traffic Safety Administration, 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

system does not apply to deep tread, winter-type snow

tires, space-saver or temporary use spare tires, tires with

nominal rim diameters of

inches

(25

cm),

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

comparative rating based on

the wear rate of the tire when tested under controlled

conditions on

specified government test course. For

example, a tire graded

150

would wear one and a half

(

1/2)

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.

Traction

The

traction grades, from highest to lowest, are A,

and

and they represent the tire’s ability to stop on wet

pavement as measured under controlled conditions on

specified government test surfaces of asphalt and concrete.

tire marked

may have poor traction performance.

Warning: The traction grade assigned to this tire

based

on braking (straight ahead) traction tests and does not

include cornering (turning) traction.

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Chevrolet TRACKER 1997 Owner's Manual Page 283

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