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.
6-40
~
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