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chapter for additional infor‐
mation.
Wheel size designation
Wheels are also marked with important
information that you need if you ever
have to replace one. The following ex‐
plains what the letters and numbers in
the wheel size designation mean.
Example wheel size designation: 6.0J x
15
6.0 - Rim width in inches.
J - Rim contour designation.
15 - Rim diameter in inches.
Tire speed ratings
The chart below lists many of the dif‐
ferent speed ratings currently being
used for passenger cars. The speed
rating is part of the tire size designa‐
tion on the sidewall of the tire. This
symbol corresponds to that tire's de‐
signed maximum safe operating speed.
Speed
Rating
Symbol
Maximum Speed
S 180 km/h (112 mph)
T 190 km/h (118 mph)
Speed
Rating
Symbol
Maximum Speed
H 210 km/h (130 mph)
V 240 km/h (149 mph)
W 270 km/h (168 mph)
Y
Above 300 km/h (186
mph)
3. Checking tire life (TIN : Tire
Identification Number)
Any tires that are over 6 years, based
on the manufacturing date, tire
strength and performance, decline with
age naturally (even unused spare tires).
Therefore, the tires (including the spare
tire) should be replaced by new ones.
You can find the manufacturing date on
the tire sidewall (possibly on the inside
of the wheel), displaying the DOT Code.
The DOT Code is a series of numbers on
a tire consisting of numbers and English
letters. The manufacturing date is des‐
ignated 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 numbers indi‐
cate week and year manufactured.
For example:
DOT XXXX XXXX 1619 represents that
the tire was produced in the 16th week
of 2019.
WARNING
n Tire age
Tires degrade over time, even when
they are not being used. Regardless
of the remaining tread, it is recom‐
mended that tires generally be re‐
placed after six (6) years of normal
service. Heat caused by hot climates
or frequent high loading conditions
can accelerate the aging process.
Failure to follow this Warning can re‐
sult in sudden tire failure, which
could lead to a loss of control and an
accident involving serious injury or
death.
4. Tire ply composition and material
The number of layers or plies of rub‐
ber- coated fabric in the tire. Tire man‐
ufacturers also must indicate the ma‐
terials 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
construction; and the letter "B" means
belted-bias ply construction.
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Maintenance