Maintenance
668
Tyres and wheels
The following explains what the let
-
ters and numbers in the tyre size
designation mean.
Example tyre size designation:
(These numbers are provided as an
example only; your tyre size desig
-
nator could vary depending on your
vehicle.)
P235/55R19 108T
P - Applicable vehicle type (tyres
marked with the prefix 䳖P䳓䳓 are
intended for use on passenger vehi
-
cles or light trucks; however, not all
tyres have this marking).
235 -Tyre width in millimeters.
55 - Aspect ratio. The tyre䳓s section
height as a percentage of its width.
R - Tyre construction code (Radial).
19 - Rim diameter in inches.
108 - Load Index, a numerical code
associated with the maximum load
the tyre 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
important information that you
need if you ever have to replace one.
The following explains what the let
-
ters and numbers in the wheel size
designation mean.
Example wheel size designation:
7.5JX19
7.5 - Rim width in inches.
J - Rim contour designation.
19 - 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.
3. Checking tyre life (TIN : Tyre
Identification Number)
Any tyres that are over 6 years old,
based on the manufacturing date,
(including the spare tyre) should be
replaced by new ones. You can find
the manufacturing date on the tyre
sidewall (possibly on the inside of
the wheel), displaying the DOT Code.
The DOT Code is a series of numbers
Speed Rating
Symbol
Maximum 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)
W 270 km/h (168 mph)
Y 300 km/h (186 mph)
Z
Above 240 km/h (149
mph)
To Next Page
Loading...
