Owner's Manual
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 (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 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.
6-51