Buick 1997 Riviera Owner's Manual Page 285

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Traction
--
A,
B,
C
The traction grades, from highest to lowest, are
A,
B,
and
-C,
and they represent the tire’s ability to stop on wet
cpavement
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
ion braking (straightahead) traction tests and does not
mclude cornering (turning) traction.
7
v.
Temperature
--
A, B,
C
The temperature grades
are
A
(the highest),
B,
and
C,
arepresenting the tire’s resistance to the generation of
!heat and its ability to dissipate heat when tested under
gcontrolled 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
nexcessive 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.
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