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 one-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, and 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
(straightahead) 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
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