Cadillac 1993 Eldorado Owner's Manual Page 325

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Treadwear
The treadwear grade is a comparative rating based on the wear rate
of
the tire when tested under controlled conditions on a specified
government test course. For example, a tire graded
150
would wear one
and a half
(1
1/2)
times
as
well
on the government course as a tire graded
100.
The relative performance
of
tires depends upon the actual
conditions of their use, however, and may depart significantly from the
norm due to variations in driving habits, service practices and differences
in road characteristics and climate.
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.
Those grades are molded
on
the
sidewalls
of
passenger car tires.
31
I
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