Mercedes-Benz C 250 Coupe, Operator'S Manual

Page: 315 / 336

For further information on the load bearing
index, see Load index (
Y
page 314).
Speed rating: speed rating
B
specifies the
approved maximum speed of the tire.
G
WARNING
Even when permitted by law, never operate a
vehicle at speeds greater than the maximum
speed rating of the tires.
Exceeding the maximum speed for which tires
are rated can lead to sudden tire failure,
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 speed rating always
observe the speed limits. Drive carefully and
adapt your driving style to the traffic
conditions.
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)
ZR...(..Y) Above 186 mph (300 km/h)
ZR Above 149 mph (240 km/h)
R
Optionally, tires with a maximum speed of
over 149 mph (240 km/h) may have "ZR"
in the size description depending on the
manufacturer (e.g. 245/40 ZR 18).
The service specifications consist of load
bearing index
A
and speed rating
B
.
R
If the size description of your tire includes
"ZR" and there are no service
specifications, ask the tire manufacturer in
order to find out the maximum speed.
If a service specification is available, the
maximum speed is limited according to the
speed rating in the service specification.
Example: 245/40 ZR 18 97 Y. In this
example, "97 Y" is the service specification.
The letter "Y" represents the speed rating
and the maximum speed of the tire is
limited to 186 mph (300 km/h).
R
Every tire that has a maximum speed above
186 mph (300 km/h) must have "ZR" in the
size description
and the service
specification must be given in brackets.
Example: 275/40 ZR 18 (99 Y). The speed
rating "(Y)" shows that the maximum speed
of the tire is above 186 mph (300 km/h).
Ask the tire manufacturer to find out the
maximum speed.
All-weather tires and winter tires
Index Speed rating
Q M+S
20
Up to 100 mph (160 km/h)
T M+S
20 Up to 118 mph (190 km/h)
H M+S
20
Up to 130 mph (210 km/h)
V M+S
20 Up to 149 mph (240 km/h)
i Not all tires that have the M+S
identification offer the driving
characteristics of winter tires. Winter tires
have, in addition to the M+S identification,
the
i
snow flake symbol on the tire
sidewall. Tires with this identification fulfill
the requirements of the Rubber
Manufacturers Association (RMA) and the
Rubber Association of Canada (RAC)
regarding the tire traction on snow and
20
Or M+S
i
for winter tires.
Tire labeling
313
Wheels and tires
Z