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,
By
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.
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