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7-60
Maintenance
Tire speed ratings
The chart below lists many of the dif-
ferent 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 oper-
ating speed.
3. Checking tire life
(TIN : Tire Identification
Number)
Any tires that are over 6 years old,
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 num-
bers and English letters. The manu-
facturing 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 num-
bers indicate week and year manu-
factured.
For example:
DOT XXXX XXXX 1615 represents
that the tire was produced in the 16th
week of 2015.
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 condi-
tions can accelerate the aging
process. Failure to follow this
Warning can result in sudden
tire failure, which could lead to
a loss of control and an acci-
dent involving serious injury or
death.
WARNING
Speed
Rating
Symbol
Maximum Speed
S 180 km/h (112 mph)
T 190 km/h (118 mph)
H 210 km/h (130 mph)
V 240 km/h (149 mph)
Z Above 240 km/h (149 mph)
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