1998 Oldsmobile Aurora Owner's Manual - Page 300

1998 Oldsmobile Aurora Manual

Page 300 highlights

Uniform Tire Quality Grading The followinginformation 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 onlyto vehicles sold in the United States.) The grades aremolded 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 sparetires, tires with nominal rim diameters of 10 to 12 inches(25 to 30 cm), or tosome limited-production tires. While the tires available onGeneral 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. 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, and they represent the tire's ability to stop on wet pavement as measured under controlledconditions on specified government test surfaces of asphalt have poor and concrete. A tire marked C may 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 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 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. 6-48

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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.) 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 10 to
12
inches
(25 to
30
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
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,
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.
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.
6-48