1994 Chevrolet Lumina Owner's Manual - Page 191

1994 Chevrolet Lumina Manual

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Treadwear The treadwear grade is a comparative rating based on the wear of the tire rate when tested under controlled conditions on a specified government test course. For 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 maydepart significantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate. 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. - Uniform Tire Quality Grading The following information relates to the system developed bythe 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.) 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. - 189...

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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. For
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.
These
grades are molded
on
the
sidewalls
of
passenger car tires.
189...