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Maintenance
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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 car. The following
explains what the letters and num-
bers in the tire size designation
mean.
Example tire size designation:
155/70 R13 75T
(These numbers are provided as an
example only; your tire size designa-
tor could vary depending on your
vehicle.)
155 - Tire width in millimeters.
70 - Aspect ratio. The tire’s section
height as a percentage of its
width.
R - Tire construction code (Radial).
13 - Rim diameter in inches.
75 - Load Index, a numerical code
associated with the maximum
load the tire can carry.
T - Speed Rating Symbol. See the
speed rating chart in this section
for additional information.
Wheel size designation
Wheels are also marked with impor-
tant information that you need if you
ever have to replace one. The follow-
ing explains what the letters and
numbers in the wheel size designa-
tion mean.
Example wheel size designation:
4.5 J x 13
4.5 - Rim width in inches.
J - Rim contour designation.
13 - Rim diameter in inches.
Tire speed ratings
The chart below shows many of the
different speed ratings currently
being used for passenger car. The
speed rating symbol 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.
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)
Maximum Speed
Speed
Rating
Symbol
1SAA5046
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