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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) 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 41 psi
(2.8 bar) and 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 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 1.0 mi
(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.
334
MKZ Hybrid (CC9) Hybrid Electric Vehicle (HEV), Canada/United States of America, enUSA, Edition date: 201706, Second Printing
Wheels and Tires
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