IMPREZA U.S.A. (E)
12-2
For U.S.A.
The following information has been compiled according to Code of Fed-
eral Regulations “Title 49, Part 575”.
Uniform tire quality grading standards
This information indicates the relative performance of passenger car tires
in the area of treadwear, traction, and temperature resistance. This is to
aid the consumer in making an informed choice in the purchase of tires.
These grades are molded in the sidewall of the tire and can be inter-
preted by referring to the following information:
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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 govern-
ment 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 rela-
tive performance of tires depends upon the actual conditions of their
use, however, and may depart significantly from the norm due to varia-
tions in driving habits, service practices and differences in road charac-
teristics and climate.
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Traction A, B, C
The traction grades, from highest to lowest, are A, B and C, and they
represent a 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 a tire is based on braking (straigh-
tahead) traction tests and does not include cornering (turning)
traction.
