Maintenance
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2. Tyre size designation
A tyre’s sidewall is marked with a tyre
size designation. You will need this
information when selecting replacement
tyres for your car. The following explains
what the letters and numbers in the tyre
size designation mean.
Example tyre size designation:
(These numbers are provided as an
example only; your tyre size designator
could vary depending on your vehicle.)
155/70R13 75S
155 - Tyre width in millimeters.
70 - Aspect ratio. The tyre’s section
height as a percentage of its width.
R - Tyre construction code (Radial).
13 - Rim diameter in inches.
75 - Load Index, a numerical code
associated with the maximum load
the tyre can carry.
S - 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:
4.5JX13
4.5 - Rim width in inches.
J - Rim contour designation.
13 - Rim diameter in inches.
Tyre speed ratings
The chart below lists many of the
different speed ratings currently being
used for passenger car tyres. The speed
rating is part of the tyre size designation
on the sidewall of the tyre. This symbol
corresponds to that tyre'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
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