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Vehicle Care 9-79
Traction – AA, A, B, C
The traction grades, from
highest to lowest, are AA, A, B,
and C. Those grades represent
the tire's ability to stop on wet
pavement as measured under
controlled conditions on
specified government test
surfaces of asphalt and
concrete. A tire marked C may
have poor traction performance.
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.
It should be noted that 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 tires and wheels on your
vehicle were aligned and balanced
carefully at the factory to give you
the longest tire life and best overall
performance. Adjustments to wheel
alignment and tire balancing will not
be necessary on a regular basis.
However, if you notice unusual tire
wear or your vehicle pulling to one
side or the other, the alignment
might need to be checked. If you
notice your vehicle vibrating when
driving on a smooth road, the tires
and wheels might need to be
rebalanced. See your dealer/retailer
for proper diagnosis.
CTS-V models should only use
adhesive wheel weights to balance
the tires and wheels.