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Maintenance
what the letters and numbers in the tire
size designation mean.
Example tire size designation:
(These numbers are provided as an
example only; your tire size designator
could vary depending on your vehicle.)
P235/65R17 108T
僅 P: Applicable vehicle type (tires
marked with the prefix "P" are
intended for use on passenger vehi-
cles or light trucks; however, not all
tires have this marking).
僅 235: Tire width in millimeters.
僅 65: Aspect ratio. The tire's section
height as a percentage of its width.
僅 R: Tire construction code (Radial).
僅 17: Rim diameter in inches.
僅 108: Load Index, a numerical code
associated with the maximum load
the tire can carry.
僅 T: Speed Rating Symbol. See the
speed rating chart in this section for
additional information.
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:
7.0JX17
僅 7.0: Rim width in inches.
僅 J: Rim contour designation.
僅 17: Rim diameter in inches.
Tire speed ratings
The chart below lists many of the differ-
ent speed ratings currently being used
for passenger vehicle tires. The speed
rating is part of the tire size designation
7
40
on the sidewall of the tire. This symbol
corresponds to that tire's designed max-
imum safe operating speed.
Speed Rating
Symbol
S
T
H
V
W
Y
3. Checking tire life
Any tires that are over 6 years old, based
on the manufacturing date, should be
replaced by new ones. You can find the
manufacturing date on the tire sidewall
(possibly on the inside of the wheel), dis-
playing 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 1621 represents that
the tire was produced in the 16th week
of 2021.
WARNING
Tire age
Replace tires within the recommended
time frame. Failure to replace tires as
recommended can result in sudden tire
failure, which could lead to a loss of con-
trol and an accident.
Tires and wheels
Maximum Speed
180 km/h (112 mph)
190 km/h (118 mph)
210 km/h (130 mph)
240 km/h (149 mph)
270 km/h (168 mph)
300 km/h (186 mph)
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