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424 Wheels and tires
First letter(s) 1:
Without: passenger vehicle tires according to
R
European manufacturing standards.
"P": passenger vehicle tires according to US
R
manufacturing standards.
"LT": light truck tires according to US manu-
R
facturing standards.
"T": compact emergency spare wheels with
R
high tire pressure that are only designed for
temporary use in an emergency.
Aspect ratio 3:
Ratio between tire height and tire width in percent
(tire height divided by tire width).
Tire code
4
(tire type):
"R" radial tire
R
"D": bias ply tire
R
"B": bias belted tires
R
"ZR": radial tire with a maximum speed above
R
149 mph (240 km/h) (optional)
Rim diameter 5:
The diameter of the bead seat (not the diameter
of the rim flange). The rim diameter is specified in
inches (in).
Load-bearing index 6:
Numerical code that specifies the maximum load-
bearing capacity of a tire (e.g. "91" corresponds
to 1,356 lbs (615 kg)).
The load-bearing capacity of the tire must be at
least half the gross axle weight rating of your vehi-
cle. Do not overload the tires by exceeding the
specified load limit.
See also:
Maximum permissible load on the Tire and
R
Loading Information placard (
/
Maximum tire load (
page 422)
/
R
Load index
R
Speed rating 7:
Specifies the approved maximum speed of the
tire.
%
An electronic speed limiter prevents your
vehicle from exceeding a speed of 130 mph
(210 km/h).
Make sure that your tires have the required speed
rating. You can obtain information on the required
speed rating from an authorized Mercedes-Benz
Center.
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)
page 416)
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)
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