Definition Of Terms For Tires And Loading - Mercedes-Benz EQB 2024 Operator's Manual

340 Wheels and tires
Index Speed rating
1 up to 186 mph (300 km/h)
ZR...Y
1 over 186 mph (300 km/h)
ZR...(..Y)
1 over 149 mph (240 km/h)
ZR
Specifying the speed rating as the "ZR" index
R
4
in tire code is optional for tires up to
186 mph (300 km/h).
If your tire code 4 includes "ZR" and there is
R
no speed rating 7, find out what the maxi-
mum speed is from the tire manufacturer.
If load-bearing index 6 and speed rating
R
are in brackets, the maximum speed rating of
your tire is above 186 mph (300 km/h). To
find out the maximum speed, ask the tire man-
ufacturer.
1 "ZR" stated in the tire code.
Or "M+Si" for winter tires.
2
All-weather tires and winter tires
Index Speed rating
2 up to 100 mph (160 km/h)
Q M+S
2 up to 118 mph (190 km/h)
T M+S
up to 130 mph (210 km/h)
2
H M+S
up to 149 mph (240 km/h)
2
V M+S
Winter tires bear the i snowflake symbol and
fulfill the requirements of the Rubber Manufactur-
ers Association (RMA) and the Rubber Association
of Canada (RAC) regarding the tire traction on
7
snow.
Load index 8:
No specification given: standard load (SL) tire
R
"XL" or "Extra Load": extra load tire or rein-
R
forced tire
"Light Load": light load tire
R
"C", "D", "E": a load range that depends on the
R
maximum load that the tire can carry at a cer-
tain pressure

Definition of terms for tires and loading

Tire structure and characteristics: describes the
number of layers or the number of rubber-coated
belts in the tire contact surface 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 kilopascal (kPa) is
the equivalent of one bar.
DOT (Department of Transportation): DOT-marked
tires fulfill the requirements of the
U.S. Department of Transportation.
Average weight of the vehicle occupants: the
number of vehicle occupants for which the vehicle
is designed, multiplied by 150 lb (68 kg).
Uniform Tire Quality Grading Standards: a uniform
standard to grade the quality of tires with regard