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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 set pressure. For
example: For P-metric tires 35 psi
(2.4 bar) or 36 (2.5 bar) depending
on tire size and for Metric tires 36 psi
(2.5 bar). 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 42 psi (2.9
bar). 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 tire 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.
• Tread area of the tire: Area of the
perimeter of the tire that contacts the
road when mounted on the vehicle.
• Rim: The metal support (wheel) for a
tire or a tire and tube assembly upon
which the tire beads are seated.
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Wheels and Tires
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