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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.
If you use bias-ply tires on your vehicle, the
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.
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.
6-44
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