Mercedes-Benz C-Class Coupe Operator's Manual page 322

Tire labeling
320
adapt your driving style to the traffic condi-
tions.
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) over 186 mph (300 km/h)
ZR over 149 mph (240 km/h)
Optionally, tires with a maximum speed of
R
over 149 mph (240 km/h) may have "ZR" in
the size description, depending on the
manufacturer (e.g. 245/40 ZR18).
The service specification is made up of
load-bearing index A and speed rating B.
If the size description of your tire includes
R
"ZR" and there are no service specifica-
tions, 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 exam-
ple, "97 Y" is the service specification. The
letter "Y" represents the speed rating. The
maximum speed of the tire is limited to
186 mph (300 km/h).
The size description for all tires with maxi-
R
mum speeds of over 186 mph (300 km/h)
must include "ZR", and the service specifi-
cation must be given in parentheses. Exam-
Or M+Si for winter tires.
5
ple: 275/40 ZR 18 (99 Y). Speed rating
"(Y)" indicates that the maximum speed of
the tire is over 186 mph (300 km/h). Ask
the tire manufacturer about the maximum
speed.
All-weather tires and winter tires
Index Speed rating
up to 100 mph (160 km/h)
5
Q M+S
up to 118 mph (190 km/h)
5
T M+S
up to 130 mph (210 km/h)
5
H M+S
up to 149 mph (240 km/h)
5
V M+S
i
Not all tires with the M+S marking provide
the driving characteristics of winter tires. In
addition to the M+S marking, winter tires
also have the i snowflake symbol on
the tire wall. Tires with this marking fulfill
the requirements of the Rubber Manufac-
turers Association (RMA) and the Rubber
Association of Canada (RAC) regarding
snow traction, and were specially devel-
oped for driving on snow.
An electronic speed limiter prevents your
vehicle from exceeding the following speeds:
all vehicles (except AMG vehicles):
R
130 mph (210 km/h)
AMG vehicles: 155 mph (250 km/h)
R
AMG vehicles with increased top speed:
R
174 mph (280 km/h)
The speed rating of tires mounted at the fac-
tory may be higher than the maximum speed
that the electronic speed limiter permits.
Make sure that your tires have the required
speed rating for your vehicle as specified in
the "tires" section (
Y
buy new tires.
Further information about reading tire data
can be obtained from any qualified specialist
workshop.
page 329), e.g. if you