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9-43
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
replacement tires for your car. The
following 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
designator could vary depending on
your vehicle.)
225/45R18 95Y
225 - Tire width in millimeters.
45 - Aspect ratio. The tire's section
height as a percentage of its width.
R - Tire construction code (Radial).
18 - Rim diameter in inches.
95 - Load Index, a numerical code
associated with the maximum load
the tire can carry.
Y - 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:
8.0J X 18
8.0 - Rim width in inches.
J - Rim contour designation.
18 - 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.
*Z: For tires above 149 mph (240
km/h), tire manufacturers sometimes
use the code "ZR"
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)
W 168 mph (270 km/h)
Y 186 mph (300 km/h)
0_IK_PE_en_US.book Page 43
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