Mercedes-Benz Coupe GT, Operator'S Manual

Page: 267 / 286

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 about the
maximum speed.
All-weather tires and winter tires
Index
Speed rating
Q M+S 13
Up to 100 mph (160 km/h)
T M+S
13 Up to 118 mph (190 km/h)
H M+S
13
Up to 130 mph (210 km/h)
V M+S 13
Up to 149 mph (240 km/h)
i
Not all tires that have the M+S
identification offer 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 identification fulfill the
requirements of the Rubber Manufacturers
Association (RMA) and the Rubber
Association of Canada (RAC) regarding the
tire traction on snow and have been
especially developed for driving on snow.
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 as specified in the "Tires"
section (
Y
page 270), e.g. if you buy new
tires.
Further information about reading tire data
can be obtained from any qualified specialist
workshop.
Load index
i
Tire data is vehicle-specific and may
deviate from the data in the example.
In addition to the load-bearing index, load
index : may be imprinted after the letters
that identify speed rating B (
Y
page 263) on
the sidewall of the tire.
R
If no specification is given: no text (as in the
example above), represents a standard
load (SL) tire
R
XL or Extra Load: represents a reinforced
tire
R
Light Load: represents a light load tire
R
C, D, E: represents a load range that
depends on the maximum load that the tire
can carry at a certain pressure
13 Or M+S i for winter tires.
Tire labeling
265
Wheels
and
tires
Z