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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
original equipment tire sizes,
recommended inflation
pressure and the maximum
weight the vehicle can carry.
• Tire Identification Number:
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.
• Cold inflation pressure: The
tire pressure when the vehicle
has been stationary and out of
direct sunlight for an hour or
more and prior to the vehicle
being driven for 1 mile (1.6 km).
• Recommended inflation
pressure: The cold inflation
pressure found on the Safety
Compliance Certification Label
(affixed to either the door hinge
pillar, door-latch post, or the
door edge that meets the
door-latch post, next to the
driver's seating position), or
Tire Label located on the
B-Pillar or the edge of the
driver’s door.
• B-pillar: The structural
member at the side of the
vehicle behind the front door
• Bead area of the tire: Area of
the tire next to the rim.
• Sidewall of the tire: Area
between the bead area and the
tread.
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Wheels and Tires
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