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7
Maintenance
4.
Tire ply composition and materi-
al
The number of layers or plies of rub-
ber-coated fabric in the tire. Tire
manufacturers also must indicate the
materials in the tire, which include
steel, nylon, polyester, and others.
The letter "R" means radial ply con-
struction; the letter "D" means diago-
nal or bias ply construction; and the
letter "B" means belted-bias ply con-
struction.
5. Maximum permissible inflation
pressure
This number is the greatest amount
of air pressure that should be put in
the tire. Do not exceed the maximum
permissible inflation pressure. Refer
to the Tire and Loading Information
label for recommended inflation
pressure.
6. Maximum load rating
This number indicates the maximum
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 grading
Quality grades can be found where
applicable on the tire sidewall
between tread shoulder and maxi-
mum chapter width.
For example:
TREAD wear 200
TRACTION AA
TEMPERATURE A
Tire age
Tires degrade over time, even
when they are not being used.
Regardless of the remaining
tread, it is recommended that tires
generally be replaced after six (6)
years of normal service. Heat
caused by hot climates or frequent
high loading conditions can accel-
erate the aging process. Failure
to follow this warning could cause
sudden tire failure, which could
lead to a loss of control and an
accident involving serious injury or
death.
WARNING
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