Chevrolet 1993 Camaro Owner's Manual download pdf (Page 220)

Service and Appearance Care

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.)

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.

Fa

example, a tire graded

150

would wear

one and a half

(1

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

-

A,

B,

C

The traction grades, from highest to

lowest are: A,

B,

and

C.

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. 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 cornering (turning) traction.

Temperature

-

A,

B,

C

The temperature grades are

A

(the

highest),

B,

and

C,

representing the tire’s

resistance to

the

generation of heat and its

ability to dissipate heat when tested under

controlled conditions on a specified

indoor laboratory test wheel. Sustained

high temperature can cause the material

of the tire to degenerate and reduce tire

life, and excessive temperature can lead to

sudden tire failure. The grade

C

corresponds

to

a level of performance

which all passenger car 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.

Warning: The temperature grade for this

tire is established for a tire that is properly

inflated and not overloaded. Excessive

speed, underinflation, or excessive

loading, either separately or in

combination, can cause heat buildup and

possible tire failure.

Those grades are molded on the sidewalls

of passenger car tires.

While the tires available as standard or

optional equipment on General Motors

vehicles may vary with respect to these

grades, all such tires meet General Motors

performance standards and have been

approved for use on General Motors

vehicles.

All

passenger type

(P

Metric)

tires must conform to Federal safety

requirements

in

addition to these grades.

.

.

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