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214 Wheels and tires
Aspect ratio (in percent)
3
3
The size ratio between the tire height and tire
width and is shown in percent (tire height divided
by tire width).
Tire code
4
4
(tire type):
"R": radial tire
R
Rim diameter
5
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
6
:
Numerical code which specifies the maximum
load-bearing capacity of a tire ("91" equals, e.g.
1,356 lb (615 kg)).
The tire load-bearing capacity must be at least
half the gross axle weight rating of the vehicle.
Do not overload the tires by exceeding the maxi‐
mum permissible load.
See also:
Maximum permissible load on the Tire and
R
Loading Information placard
Maximum tire load (
/
R
Load index
R
Speed rating
8
8
:
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).
Ensure that your tires have the required speed
rating. You can obtain information on the
required speed rating at a Mercedes-Benz Com‐
mercial Van Center.
Summer tires
Index
Speed rating
L
Up to 75 mph (120 km/h)
M
Up to 81 mph (130 km/h)
N
Up to 87 mph (140 km/h)
P
Up to 93 mph (150 km/h)
Q
Up to 100 mph (160 km/h)
R
Up to 106 mph (170 km/h)
Summer, all-season and winter tires
:
1
Winter tires are marked with the i snowflake
symbol and fulfill the requirements of the Rubber
Manufacturers Association (RMA) and the Rubber
Association of Canada (RAC) regarding the tire
traction on snow.
Load index
R
R
page 213)
Tire structure and characteristics: describes
the number of layers or the number of rubber-
coated layers in the tire tread and the tire wall.
These are made of steel, nylon, polyester and
other materials.
Bar: metric unit for tire pressure.
14.5038 pounds per square inch (psi) and
100 kilopascals (kPa) are the equivalent of 1 bar.
DOT (Department of Transportation): DOT
marked tires fulfill the requirements of the
U.S. Department of Transportation.
Average weight of vehicle occupants: the
number of occupants for which the vehicle is
designed multiplied by 150 lbs (68 kg).
Uniform Tire Quality Grading Standards: a uni‐
form standard to grade the quality of tires with
regards to tread quality, tire traction and temper‐
ature characteristics. The quality grading assess‐
ment is made by the manufacturer in accordance
with test specifications of the U.S. government.
The quality grade of a tire is imprinted on the
sidewall of the tire.
Recommended tire pressure: the recommen‐
ded tire pressure is the pressure specified for the
tires installed on the vehicle at the factory.
Index
Speed rating
Up to 75 mph (120 km/h)
1
L M+S
Up to 81 mph (130 km/h)
1
M M+S
Up to 87 mph (140 km/h)
N M+S
1
Up to 93 mph (150 km/h)
1
P M+S
Up to 100 mph (160 km/h)
Q M+S
1
Up to 118 mph (170 km/h)
1
R M+S
: or "M+S i" for winter tires.
7
7
:
"Light load": light load tire
"C": commercial tires
Information on definitions (tires and load‐
ing)
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