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J. Tire Ply Composition and
Material Used: Indicates the number
of plies or the number of layers of
rubber-coated fabric in the tire tread
and sidewall. Tire manufacturers also
must indicate the ply materials in the
tire and the sidewall, which include
steel, nylon, polyester, and others.
K. Maximum Load: Indicates the
maximum load in kilograms and
pounds that can be carried by the tire.
Refer to 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), for the correct tire
pressure for your vehicle.
L. Treadwear, Traction and
Temperature Grades:
• 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.
309
Wheels and Tires
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