Traction
-
A, B,
C
The traction grades, from highest to lowest are:
A,
B,
and
C.
They 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.
Warning:
The
traction grade assigned
to
this tire is based on braking
(straight-ahead) traction tests and does not include cornering (turning)
traction.
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.
6-67
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