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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.
{ WARNING
The traction grade assigned
to this tire is based on
straight-ahead braking
traction tests, and does not
include acceleration,
cornering, hydroplaning, or
peak traction characteristics.
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.
Vehicle Service and Care 9-57