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
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.
*
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 kilometers).
270
Fusion/Mondeo (CC7)
Wheels and Tires
