Mercedes-Benz C-Class Coupe 2019 Operator's Manual page 396

394 Wheels and tires
1 Preceding letter
2 Nominal tire width in millimeters
3
Aspect ratio in %
4
Tire code
5 Rim diameter
6 Load-bearing index
7 Speed rating
8 Load index
% The data shown in the image is example
data.
Information about reading tire data can be
obtained from any qualified specialist workshop.
Preceding letter 1 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 3 :
Ratio between tire height and tire width in per‐
cent (tire height divided by tire width).
Tire code 4 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
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149 mph (240 km/h) (optional)
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 that specifies the maximum
load-bearing capacity of a tire (e.g. "91" corre‐
sponds to 1356 lbs (615 kg)).
The load-bearing capacity of the tire must be at
least half the permissible axle load of your vehi‐
cle. Do not overload the tires by exceeding the
specified load limit.
See also:
Maximum permissible load on the Tire and
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Loading Information placard
( page 386)
/
Maximum tire load ( page 392)
/
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Load index
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Speed rating 7 7 :
Specifies the approved maximum speed of the
tire.