Preceding letter 11:
R
Without:passenger vehicle tires according to
Europeanmanufacturing standards.
R
"P": passenger vehicle tires according to US
manufacturing standards.
R
"LT": light trucktires accordingtoUSmanu‐
facturing standards.
R
"T": compact emergency spare wheels with
high tirepressurethat areonly designedfor
temporaryuse in an emergency.
Aspectratio 3
3:
Ratio betweentireheight and tirewidth in per‐
cent (tire height divided by tirewidth).
Tirecode 44 (tire type):
R
"R"radial tire
R
"D": bias ply tire
R
"B": bias belted tires
R
"ZR": radial tirewithamaximum speed above
149mph (240 km/h) (optional)
Rim diameter 55:
The diameter of thebead seat (notthe diameter
of therim flange). The rimdiameterisspecified
in inches (in).
Load-bearing index 6
6:
Numerical code that specifies themaximum
load-bearing capacity of atire(e.g. "91" corre‐
sponds to 1356 lbs (615 kg)).
The load-bearing capacity of thetiremustbeat
leasthalf thepermissible axle load of your vehi‐
cle. Do notoverload thetires by exceeding the
specified load limit.
See also:
R
Maximum permissible load on theTireand
Loading Informationplacard(/page454)
R
Maximum tireload (/ page461 )
R
Load index
Speed rating 7
7:
Specifiesthe approvedmaximum speed of the
tire.
%
An electronicspeed limiterprevents your
vehicle from exceeding aspeed of 130mph
(210 km/h).
Make surethat your tires have therequired
speed rating.You can obtain information on the
required speed rating from an authorized
Mercedes-Benz Center.
Summer tires
IndexSpeedrating
Qupto100 mph(160km/h)
Rupto106 mph(170km/h)
Supto112 mph(180km/h)
Tupto118 mph(190km/h)
Hupto130 mph(210km/h)
Vupto149 mph(240km/h)
Wupto168 mph(270km/h)
Yupto186 mph(300 km/h)
Wheels andtires
463
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