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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