Uniform
Tire
Quality
Grading
The following information relates
to
the system developed by the United
States National Highway Traffic Safety Administration which grades tires
by treadwear, traction and temperature performance. (This applies only
to
vehicles sold in the United States.)
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.
6-47
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