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. Grades B and
A
represent higher levels of
performance
on
the laboratory test wheel than the
minimum required by law.
Warning: The temperature grade for this tire is
established for a tire
that
is
properly inflated and not
overloaded. Excessive speed, underinflation, or
excessive loading, either separately or in combination,
can cause heat buildup and possible tire failure.
These grades are molded
on
the sidewalls of passenger
car tires.
While the tires available as standard or optional
equipment on General Motors vehicles may vary with
respect to these grades, all such tires meet General
Motors performance standards and have been approved
for use on General Motors vehicles. All passenger type
(P
Metric) tires must conform to Federal safety
requirements
in
addition to these grades.
Wheel Alignment and Tire Balance
The wheels on your vehicle were aligned and balanced
carefully at the factory to give you the longest tire life
and best overall performance.
In most cases, you will
not
need to have your wheels
aligned again. However, if you notice unusual tire wear
or your vehicle pulling one way or the other, the
alignment may need to be reset.
If
you notice your
vehicle vibrating when driving on
a
smooth road, your
wheels may need to be rebalanced.
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