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.
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.
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.
6-49
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