SUBARU BRZ 2023 Owners Manual
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Uniform Tire Quality Grading Standards
405
Consumer Information and Reporting Safety Defects13
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on the vehicle. That weight may not
safely exceed the available cargo
and luggage load capacity calcu-
lated in Step 4.
13-3. Uniform Tire Quality Grading StandardsThis information i ndicates the rela-
tive performance of passenger car
tires in the area of treadwear, trac-
tion, and temperature resistance.
This is to aid the consumer in
making an informed choice in the
purchase of tires.
Quality grades can be found where
applicable on the tire sidewall
between tread shoulder and
maximum section width. For
example:
TREADWEAR 200 TRACTION AA
TEMPERATURE A
The quality grades apply to new
pneumatic tires for use on
passenger cars. However, they do
not apply to deep tread, winter type
snow tires, space-saver or tempo-
rary use spare tires, tires with
nominal rim diameters of 12 inches
or less, or to some limited produc-
tion tires. All passenger car tires must
conform to Federal Safety Require-
ments in addition to these grades.
■ TREADWEARThe treadwear grade is a compara-
tive 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 AA, A, B, CThe 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
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Reporting Safety Defects (USA)
406specified government test surfaces
of asphalt and concrete. A tire
marked C may have poor traction
performance.■ TEMPERATURE A, B, CThe 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 condi-
tions on a specified indoor labora-
tory 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 Stan-
dard No. 109. Grades B and A
represent higher levels of perfor-
mance on the laboratory test wheel
than the minimum required by law.
13-4. Reporting Safety Defects (USA)If you believe that your vehicle has
a defect which could cause a crash
or could cause injury or death, you
should immediately inform the
National Highway Traffic Safety
Administration (NHTSA) in addition
to notifying Subaru of America, Inc.
If NHTSA receives similar
complaints, it may open an investi-
gation, and if it finds that a safety
defect exists in a group of vehicles,
it may order a recall and remedy
campaign. However, NHTSA
cannot become involved in indi-
vidual problems between you, your
dealer, or Subaru of America, Inc.
To contact NHTSA, you may call the
Vehicle Safety Hotline toll-free at 1-
888-327-4236 (TTY: 1-800-424-
9153); go to http://
www.safercar.gov; or write to:
Administrator, NHTSA, 1200 New
Jersey Avenue, SE, West Building,
Washington, DC 20590. You can
also obtain other information about
WARNING
The traction grade assigned to
this tire is based on straight-
ahead braking traction tests,
and does not include accelera-
tion, cornering, hydroplaning,
or peak traction characteris-
tics.
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 fail-
ure.
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How to Contact Transport Canada in Order to Report a Safety Concern Relating to the Vehicle (Canada)
407
Consumer Information and Reporting Safety Defects13
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motor vehicle safety from http://
www.safercar.gov.
13-5. How to Contact Trans-
port Canada in Order to
Report a Safety Concern
Relating to the Vehicle (Canada)
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