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.
6-48
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