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the size description, depending on the man-
ufacturer (e.g. 245/40ZR18).
The service specification is made up of load-
bearing index A and speedrating B.
R
If the size description of your tire includes
"ZR" and there arenoservice specifications,
askthe tire manufacturer in order to findout
the maximum speed.
If aservice specification is available, the max-
imum speedislimited according to the speed
rating in the service specification. Example:
245/40ZR1897Y.Inthis 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).
R
The size descriptionfor all tires with maxi-
mum speedsofover 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 aboutthe maximum speed.
All-weather tires and winter tires
Index Speed rating
QM+S
1
up to 100 mph (160 km/h)
TM+S
1
up to 118 mph (190 km/h)
HM+S
1
up to 130 mph (210 km/h)
VM+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 symbolonthe 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 yourvehi-
cle from exceeding aspeed of 130 mph
(210 km/h).
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 yourtires have the required
speed rating, e.g. when buying new tires. The
required speed rating for yourvehicle can be
found in the "Tires" section (
Y page 316).
Further information aboutreading tire data can
be obtained from any qualifiedspecialist work-
shop.
Load index
In addition to the load-bearing index, load
index : may be imprinted after the letters that
identify speed rating on the sidewall of the tire.
Speed rating (
Y page 307).
R
If no specification is given: no text (as in the
example above), represents astandard load
(SL) tire
R
XL or ExtraLoad: represents areinforced tire
R
Light Load: represents alightload tire
R
C, D, E: represents aload range that depends
on the maximum load that the tire can carry at
acertain pressure
i
Tire data is vehicle-specific and may deviate
from the data in the example.
Maximum load rating
1
Or M+S i for winter tires.
Allabout wheels and tires
309
Wheelsand tires
Z
311


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