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"ZR" in the size description, depending on the
manufacturer (e.g. 245/40 ZR 18).
Rim diameter: rim diameter ? is the diameter
of the bead seat, not the diameter of the rim
flange. The rim diameter is specified in
inches (in).
Load-bearing index: load-bearing index A is a
numerical code that specifies the maximum
load-bearing capacity of a tire.
Do not overload the tires by exceeding the
specified load limit. The maximum permissible
load can be found on the vehicle's Tire and
Loading Information placard on the B-pillar on
the driver's side (Y page 340).
Example:
Load-bearing index 91 indicates a maximum
load of 1,356 lb (615 kg) that the tires can bear.
For further information on the maximum tire
load in kilograms and lbs, see (Y page 347).
For further information on the load bearing
index, see "Load index" (Y page 347).
Speed rating: speed rating B specifies the
maximum permissible speed of the tire.
i
Tire data is vehicle-specific and may deviate
from the data in the example.
Regardless of the speed rating, always observe
the speed limits. Drive carefully and adapt your
driving style to the traffic conditions.
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)
R
Optionally, tires with a maximum permissible
speed of 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.
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 permissible speed.
If a service specification is available, the max-
imum permissible speed is limited according
to the speed rating in the service specifica-
tion. Example: 245/40 ZR18 97 Y. In this
example, "97 Y" is the service specification.
The letter "Y" represents the speed rating. The
maximum permissible speed of the tire is limi-
ted to 186 mph (300 km/h).
R
The size description for all tires with maxi-
mum permissible speeds of over 186 mph
(300 km/h) must include "ZR", and the ser-
vice specification must be given in parenthe-
ses. Example: 275/40 ZR 18 (99 Y). Speed
rating "(Y)" indicates that the maximum per-
missible speed of the tire is over 186 mph
(300 km/h). To find out the maximum per-
missible speed, ask the tire manufacturer.
All-weather tires and winter tires
Index Speed rating
Q M+S
1
up to 100 mph (160 km/h)
T M+S
1
up to 118 mph (190 km/h)
H M+S
1
up to 130 mph (210 km/h)
V M+S
1
up to 149 mph (240 km/h)
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 a speed of 130 mph
(210 km/h).
1
Or M+S i for winter tires.
346
All about wheels and tires
Wheels and tires
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