Mercedes-Benz 2009 M-Class Operator's Manual page 263

capability of the tire, the service
description for the tire must be referred to.
The service description is comprised of tire
load rating and tire speed rating 6.
5
If your tire includes "ZR" in the size
designation and no service description is
given, the tire manufacturer must be
consulted for the maximum speed
capability.
If a service description is given, the speed
capability 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
capability of the tire is limited to 186 mph
(300 km/h).
Any tire with a speed capability above
R
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 parenthesis 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.
16 or M+S.for winter tires
All-season and winter tires
Index Speed rating
16 up to 100 mph (160 km/h)
Q M+S
16 up to 118 mph (190 km/h)
T M+S
16 up to 130 mph (210 km/h)
H M+S
16 up to 149 mph (240 km/h)
V M+S
i Not all M+S rated tires provide 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
Rubber Manufacturers Association (RMA)
and the Rubber Association of Canada
(RAC) and have been designed specifically
for use in snow conditions.
An electronic speed limiter prevents your
vehicle from exceeding a speed of:
All models except ML 63 AMG:
R
130 mph (210 km/h)
ML 63 AMG:
R
Tires and wheels
155 mph (250 km/h)
ML 63 AMG with increased top speed:
R
171 mph (275 km/h)
The factory equipped tires on your vehicle
may have a tire speed rating above the
maximum speed permitted by the electronic
speed limiter.
Make sure your tires have the required tire
speed rating as specified for your vehicle in
the "Technical data" section (
for example when purchasing new tires.
If you are uncertain about the correct reading
of the information given on a tire's sidewall,
any authorized Mercedes-Benz Center will be
glad to assist you.
Operation
Y page 401),
Z
261