1994 Chevrolet Cavalier Owner's Manual - Page 186

1994 Chevrolet Cavalier Manual

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Uniform Tire Qualify Grading The following information relates to the system developedby the United States National Highway Traffic Safety Administration which grades tires by treadwear, traction and temperature performance. (This applies only to vehicles soldin 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 specifiedgovernment test course. For example, a tire graded 150 would wear one anda half (1Yz) 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 highestto lowest are: A, B, and C. They represent the tire's abilityto stop on wet pavement as measured under controlled conditions on specified governmenttest 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 (straightahead) 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 andits 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 tires must meet car under theFederal Motor Vehicle Safety Standard No. 109. Grades B and A represent higher levelsof 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 inflatedand not overloaded. Excessive speed, underinflation, or excessive loading, either separately or in combination, can cause heat buildup and possible tire failure. These grades are molded on the sidewalls of passenger car tires. While the tires available as standard or optional equipment on General Motors vehicles may varywith respect to these grades, all such tires meet General Motors performance standards and have beenapproved for use on General Motors vehicles. All passenger type (P Metric) tires must conform to Federal safety requirements in addition to these grades. 1

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Uniform
Tire
Qualify
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. For example, a tire graded
150
would wear one
and a half
(1
Yz)
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.
These 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
beenapproved 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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