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The traction grades, from highest to
lowest are AA, A, B, and C. The grades
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.
Temperature A B C
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 failure.
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.
139. Grades B and A represent higher
levels of performance on the
laboratory test wheel than the
minimum required by law.
Glossary of Tire Terminology
• Tire label: A label showing the OE
(Original Equipment) tire sizes,
recommended inflation pressure
and the maximum weight the
vehicle can carry.
• Tire Identification Number
(TIN): A number on the sidewall
of each tire providing information
about the tire brand and
manufacturing plant, tire size and
date of manufacture. Also referred
to as DOT code.
• Inflation pressure: A measure of
the amount of air in a tire.
• Standard load: A class of
P-metric or Metric tires designed
to carry a maximum load at 35 psi
[37 psi (2.5 bar) for Metric tires].
Increasing the inflation pressure
beyond this pressure will not
increase the tire’s load carrying
capability.
• Extra load: A class of P-metric or
Metric tires designed to carry a
heavier maximum load at 41 psi
[43 psi (2.9 bar) for Metric tires].
Increasing the inflation pressure
beyond this pressure will not
increase the tire’s load carrying
capability.
• kPa: Kilopascal, a metric unit of
air pressure.
• PSI: Pounds per square inch, a
standard unit of air pressure.
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Wheels and Tires
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