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CAUTION:
-
I
Mixing tires could cause you to lose control while
driving.
If
you mix tires
of
different sizes or type!
(radial and bias-belted tires), the vehicle may no1
handle properly, and you could have a crash.
Using tires of different sizes may also cause
damage to your vehicle. Be sure to use the same
size and type tires on all four- wheels.
It's all right to drive with your compact spare,
'
though.
It
was developed for use on your vehicle.
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.)
!
I -
. .
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.
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