Mercedes-Benz SL SERIES Operator's Manual page 586

All about wheels and tires
584
Sum-
mer
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 ZR18 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+S i for winter tires.
1
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 win-
ter 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 requirements of the Rubber Manufac-
turers Association (RMA) and the Rubber
Association of Canada (RAC) regarding the
tire traction on snow. They have been espe-
cially developed for driving on snow.
An electronic speed limiter prevents your
vehicle 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 (Perform-
-
ance Package)
Mercedes-AMG SL 65 increased maxi-
-
mum speed