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 base(
the wear rate of
the
tire when tested under control
conditions on
a
specified government test course.
j
on
led
For
example, a tire gkded
150
would wear one and
a
half
(
I
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
G.
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.
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