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Tires and wheels
225
and Loading Information placard on the
driver’s door B-pillar. Overloading the tires
can overheat them, possibly causing a
blowout. Overloading the tires can also
result in handling or steering problems, or
brake failure.
Tire load rating 5 is a numerical code asso-
ciated with the maximum load a tire can sup-
port.
For example, a load rating of 91 corresponds
to a maximum load of 1356 lb (615 kg) the
tire is designed to support. See also “Maxi-
mum tire load” (Y page 228) where the max-
imum load associated with the load index is
indicated in kilograms and lbs.
For additional information on tire load rating,
see “Load identification” (Y page 226).
Tire speed rating
G
Warning!
Even when permitted by law, never operate
a vehicle at speeds greater than the maxi-
mum speed rating of the tires.
Exceeding the maximum speed for which
tires are rated can lead to sudden tire fail-
ure, causing loss of vehicle control and
possibly resulting in an accident and/or
serious personal injury and possible death,
for you and for others.
Regardless of the tire speed rating, local
speed limits should be obeyed. Use prudent
driving speeds appropriate to prevailing con-
ditions.
Tire speed rating 6 indicates the approved
maximum speed for the tire.
Summer tires
Index Speed rating
Q up to 100 mph (160 km/h)
R up to 106 mph (170 km/h)
S up to 112 mph (180 km/h)
T up to 118 mph (190 km/h)
H up to 130 mph (210 km/h)
V up to 149 mph (240 km/h)
W up to 168 mph (270 km/h)
Y up to 186 mph (300 km/h)
ZR...Y up to 186 mph (300 km/h)
Index Speed rating
ZR...(..Y) above 186 mph (300 km/h)
ZR above 149 mph (240 km/h)
R
At the tire manufacturer’s option, any tire
with a speed capability above 149 mph
(240 km/h) can include a “ZR” in the size
designation (for example: 245/40 ZR18).
To determine the maximum speed capabil-
ity of the tire, the service description for the
tire must be referred to.
The service description is comprised of tire
load rating 5 and tire speed rating 6.
If your tire includes “ZR” in the size desig-
nation and no service description is given,
the tire manufacturer must be consulted
for the maximum speed capability.
If a service description is given, the speed
capability is limited by the speed symbol in
the service description. Example:
245/40 ZR18 97Y. In this example, “97Y”
is the service description. The letter “Y”
designates the speed rating and the speed
capability of the tire is limited to 186 mph
(300 km/h).
R
Any tire with a speed capability above
186 mph (300 km/h) must include a “ZR”
Operation
Z