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Uniform
Tire
Quality Grading
Mixing tires could cause you to lose control
while driving. If you mix tires of different sizes
or types (radial and bias-belted tires), the
vehicle may not 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 wheels.
It's
all right to drive with your
compact spare, though.
It
was developed for
use on your vehicle.
I
If
you
use
bias-ply tires on your vehicle. the
I
wheel rim flanges could develop cracks after
many miles of driving.
A
tire and/or wheel
could fail suddenly, causing a crash. Use only
radial-ply tires with the wheels on your vehicle.
Quality grades can be found where applicable on the
tire sidewall between tread shoulder and maximum
section width. For example:
Treadwear
200
Traction
AA
Temperature
A
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
Performance Criteria (TPC) standards.
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