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Maintenance
248
Tires and wheels
the DOT Code. The DOT Code is a
series of numbers on a tire consist
-
ing of numbers and English letters.
The manufacturing date is desig
-
nated by the last four digits (charac
-
ters) of the DOT code.
DOT: XXXX XXXX OOOO
The front part of the DOT means a
plant code number, tire size and
tread pattern and the last four num
-
bers indicate week and year manu
-
factured.
For example:
DOT XXXX XXXX 1621 represents
that the tire was produced in the
16th week of 2021.
WARNING
Tire Age
Replace tires within the recom
-
mended time frame. Failure to
replace tires as recommended can
result in sudden tire failure, which
could lead to a loss of control and an
accident.
4. Tire ply composition and mate
-
rial
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 construction; the letter "D"
means diagonal or bias ply con
-
struction; and the letter "B" means
belted-bias ply construction.
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 maxi
-
mum permissible inflation pressure.
Refer to the Tire and Loading Infor
-
mation label for recommended infla
-
tion 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 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 recom
-
mend that tires be replaced after
approximately six (6) years of nor
-
mal service. Heat caused by hot cli
-
mate or frequent high loading
conditions can accelerate the aging
process.
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