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379
Operation
Tires and wheels
is comprised of the tire load rating 5
(
୴ page 376) and the tire speed
rating 6 (
୴ page 376).
If your tire includes “ZR” in the size
designation and no service
description 5 and 6 (
୴ page 376) is
given, the tire manufacturer must be
consulted for the maximum speed ca-
pability.
If a service description 5 and 6
(
୴ page 376) is given, the speed capa-
bility 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 capabil-
ity of the tire is limited to 186 mph
(300 km/h).
ț Any tire with a speed capability above
186 mph (300 km/h) must include a
“ZR” in the size designation AND the
service description must be placed in
parenthesis. Example: 275/40 ZR 18
(99Y). The “(Y)” speed rating in paren-
thesis designates the maximum speed
capability of the tire as being above
186 mph (300 km/h). Consult the tire
manufacturer for the actual maximum
permissible speed of the tire.
All-season and winter tires
Index Speed rating
QM+S
1
1
or M+S . for winter tires
up to 100 mph (160 km/h)
TM+S
1
up to 118 mph (190 km/h)
HM+S
1
up to 130 mph (210 km/h)
VM+S
1
up to 149 mph (240 km/h)
i
Not all M+S rated radial-ply tires pro-
vide special winter performance. Make
sure the tires you use show M+S and
the mountain/snowflake
marking .on the tire sidewall.
These tires meet specific snow traction
performance requirements of the Rub-
ber Manufacturers Association (RMA)
and the Rubber Association of Canada
(RAC) and have been designed specifi-
cally for use in snow conditions.