Chevrolet 1993 Lumina Bedienungshandbuch PDF herunterladen (Seite 231)

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 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%)

times as well on the government course

as a tire graded

100.

The relative

performance

of

tires depends upon the

Treadwear

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.

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