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Wheel size designation
Wheels are also marked with important
information that you need if you ever
have to replace one. The following
explains what the letters and numbers in
the wheel size designation mean.
Example wheel size designation:
5.0JX14
5.0 - Rim width in inches.
J - Rim contour designation.
14 - Rim diameter in inches
Tire speed ratings
The chart below lists many of the
different speed ratings currently being
used for passenger car tires. The speed
rating is part of the tire size designation
on the sidewall of the tire. This symbol
corresponds to that tire’s designed
maximum safe operating speed.
Speed Rating
SymbolMaximum Speed
S180 km/h (112 mph)
T190 km/h (118 mph)
H 210 km/h (130 mph)
V 240 km/h (149 mph)
W 270 km/h (168 mph)
Y 300 km/h (186 mph)
3. Checking tire life (TIN : Tire
Identification Number)
Any tires that are over 6 years old,
based on the manufacturing date,
(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 designated by the last four digits
(characters) 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 indicate week
and year manufactured.
For example:
DOT XXXX XXXX 2220 represents that
the tire was produced in the 22th week
of 2020.
WARNING
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
accelerate 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.
