Mercedes-Benz SL Operator's Manual page 302

All about wheels and tires
300
Summer
tires
Index Speed rating
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 man-
ufacturer (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 specifications,
ask the tire manufacturer in order to find out
the maximum speed.
If a service specification is available, the max-
imum speed is limited according to the speed
rating in the service specification. Example:
245/40 ZR18 97 Y. In this example, "97 Y" is
the service specification. The letter "Y" rep-
resents 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 specifica-
tion must be given in parentheses. Example:
275/40 ZR 18 (99 Y). Speed rating "(Y)" indi-
cates that the maximum speed of the tire is
over 186 mph (300 km/h). Ask the tire man-
ufacturer about the maximum speed.
Or M+S i for winter tires.
1
All-
weather
tires and
winter
tires
Index Speed rating
up to 100 mph (160 km/h)
1
Q M+S
up to 118 mph (190 km/h)
1
T M+S
up to 130 mph (210 km/h)
1
H M+S
up to 149 mph (240 km/h)
1
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 require-
ments of the Rubber Manufacturers Associa-
tion (RMA) and the Rubber Association of
Canada (RAC) regarding the tire traction on
snow. They have been especially developed
for driving on snow.
An electronic speed limiter prevents your vehi-
cle from exceeding the following speeds:
130 mph (210 km/h):
R
All vehicles (except Mercedes-AMG vehi-
-
cles)
155 mph (250 km/h):
R
Mercedes-AMG SL 63
-
Mercedes-AMG SL 65
-
186 mph (300 km/h):
R
Mercedes-AMG SL 63 (Performance Pack-
-
age)
Mercedes-AMG SL 65 increased maximum
-
speed
The speed rating of tires mounted at the factory
may be higher than the maximum speed that the
electronic speed limiter permits.
Make sure that your tires have the required
speed rating, e.g. when buying new tires. The
required speed rating for your vehicle can be
found in the "tires" section (
Further information about reading tire data can
be obtained from any qualified specialist work-
shop.
page 308).
Y