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23
8
8
Maintenance Tires and wheels
1. Manufacturer or brand name
Manufacturer or Brand name is
shown.
2. Tire size designation
A tire's sidewall is marked with a tire
size designation. You will need this
information when selecting replace
-
ment tires for your vehicle. The fol
-
lowing explains 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 designa
-
tor could vary depending on your
vehicle.)
P255/45R20 105H
僅 P: Applicable vehicle type (tires
marked with the prefix "P" are
intended for use on passenger
vehicles or light trucks; however,
not all tires have this marking).
僅 255: Tire width in millimeters.
僅 45: Aspect ratio. The tire's section
height as a percentage of its
width.
僅 R: Tire construction code (Radial).
僅 20: Rim diameter in inches.
僅 105: Load Index, a numerical code
associated with the maximum
load the tire can carry.
僅 H: Speed Rating Symbol. See the
speed rating chart in this section
for additional information.
Wheel size designation
Wheels are also marked with import
-
ant information that you need if you
ever have to replace one. The fol
-
lowing explains what the letters and
numbers in the wheel size designa
-
tion mean.
Example wheel size designation:
8.0JX20
僅 8.0: Rim width in inches.
僅 J: Rim contour designation.
僅 20: Rim diameter in inches.
Tire speed ratings
The chart below lists many of the
different speed ratings currently
being used for passenger vehicle
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.
3. Checking tire life (TIN: Tire
Identification Number)
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), displaying
Speed Rating
Symbol
Maximum Speed
S 112 mph (180 km/h)
T 118 mph (190 km/h)
H 130 mph (210 km/h)
V 149 mph (240 km/h)
Z Above 149 mph (240 km/h)
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