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• Treadwear The treadwear grade
is a comparative rating based on
the wear rate of the tire when
tested under controlled conditions
on a specified government test
course. For example, a tire graded
150 would wear one and one-half
times as well on the government
course as a tire graded 100.
• Traction: 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: 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.
M. Maximum Permissible Inflation
Pressure: Indicates the tire
manufacturers' maximum permissible
pressure or the pressure at which the
maximum load can be carried by the
tire. This pressure is normally higher
than the manufacturer's
recommended cold inflation pressure
which can be 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
which is located on the B-Pillar or the
edge of the driver’s door. The cold
inflation pressure should never be set
lower than the recommended
pressure on the vehicle label.
The tire suppliers may have additional
markings, notes or warnings such as
standard load, radial tubeless, etc.
Additional Information Contained
on the Tire Sidewall for LT Type
Tires
Note: Tire Quality Grades do not apply
to this type of tire.
320
Wheels and Tires
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