SMART 2016 fortwo Owner's Manual page 187

Optionally, tires with a maximum speed of
over 149 mph (240 km/h) may have "ZR" in the
size description, depending on the manufac-
turer (e.g. 245/40 ZR 18).
Rim diameter: rim diameter ? is the diam-
eter 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 maxi-
mum load-bearing capacity of a tire.
Do not overload the tires by exceeding the
specified load limit. The maximum permis-
sible load can be found on the vehicle's Tire
and Loading Information placard on the
B-pillar on the driver's side (
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 (
For further information on the load bearing
index, see "Load index" (
Speed rating: speed rating B specifies the
approved maximum 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 con-
ditions.
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)
Or M+S i for winter tires.
2
Index
ZR...(..Y) over 186 mph (300 km/h)
ZR
R
R
page 179).
Y
page 186).
Y
page 186).
Y
R
All-weather tires and winter tires
Index
Q M+S
T M+S
H M+S
V M+S
i
All about wheels and tires
Speed rating
over 149 mph (240 km/h)
Optionally, tires with a maximum speed of
over 149 mph (240 km/h) may have "ZR" in the
size description, depending on the manu-
facturer (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 "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 ZR18 97 Y. In this example,
"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
maximum speeds of over 186 mph (300 km/h)
must include "ZR", and the service speci-
fication must be given in parentheses.
Example: 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.
Speed rating
2 up to 100 mph (160 km/h)
up to 118 mph (190 km/h)
2
up to 130 mph (210 km/h)
2
2 up to 149 mph (240 km/h)
Not all tires with the M+S marking pro-
vide the driving characteristics of winter
tires. In addition to the M+S marking, win-
ter tires also have the i snowflake sym-
bol on the tire wall. Tires with this mark-
ing fulfill the requirements of the Rubber
Manufacturers Association (RMA) and the
185
Z