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.
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.
Scheduled wheel alignment and wheel balancing are not
needed. 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.
Wheel Replacement
Replace any wheel that
is
bent, cracked, or badly rusted
or corroded. If wheel
nuts
keep coming loose, the wheel,
wheel bolts and wheel nuts should be replaced.
If
the
wheel leaks air, replace
it
(except some aluminum
wheels, which can sometimes be repaired). See your
GM
dealer
if
any
of
these conditions exist.
Your dealer
will
know
the
kind
of
wheel you need.
Each new wheel should have the same load-carrying
capacity, diameter, width, offset and be mounted the
same way as the one it replaces.
If
you need to replace any of your wheels, wheel bolts
or wheel nuts, replace them only with new
GM
original
equipment parts. This way, you
will
be sure
to
have the
right wheel, wheel bolts and wheel nuts for your vehicle.
6-50
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