25
9
9
Maintenance Tires and wheels
can result in sudden tire failure,
which could lead to a loss of con
-
trol and an accident.
4. Tire ply composition and
material
The number of layers or plies of
rubber- coated fabric in the tire.
Tire manufacturers also must
indicate the materials in the tire,
which include steel, nylon, poly
-
ester, and others. The letter "R"
means radial ply construction;
the letter "D" means diagonal or
bias ply construction; and the let
-
ter "B" means belted-bias ply
construction.
5. Maximum permissible infla
-
tion pressure
This number is the greatest
amount of air pressure that
should be put in the tire. Do not
exceed the maximum permissi
-
ble inflation pressure. Refer to
the Tire and Loading Informa
-
tion label for recommended
inflation pressure.
6. Maximum load rating
This number indicates the maxi
-
mum load in kilograms and
pounds that can be carried by
the tire. When replacing the tires
on the vehicle, always use a tire
that has the same load rating as
the factory installed tire.
7. Uniform Tire Quality Grad
-
ing
Quality grades can be found
where applicable on the tire side
-
wall between tread shoulder and
maximum section width.
For example:
僅Treadwear 200
僅Traction AA
僅Temperature A
Tires degrade over time, even
when they are not being used.
Regardless of the remaining
tread, we recommend that tires
be replaced after approximately
six (6) years of normal service.
Heat caused by hot climate or
frequent high loading conditions
can accelerate the aging process.
Tread wear
The tread wear grade is a com
-
parative 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-
a-half times (1½) as well on the
government course as a tire
graded 100.
The relative performance of tires
depends upon the actual condi
-
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