Speed rating
The speed rating is part of the tire identification.It specifies the speed range for which the tire is
approved.
GTW (Gross Trailer Weight)
The GTW is the weight of a trailer including the
weight of the load, luggage, accessories etc. on
the trailer.
GVW (Gross Vehicle Weight)
The gross vehicle weight includes the weight of
the vehicle including fuel, tools, the spare wheel,
accessories installed, occupants, luggage and
the drawbar noseweight, if applicable. The gross
vehicle weight must not exceed the gross vehi-
cle weight rating GVWR as specified on the vehi- cle identification plate on the B-pillar on the
driver's side.
GVWR (Gross Vehicle Weight Rating)
The GVWR is the maximum permissible gross
weight of a fully loaded vehicle (the weight of the
vehicle including all accessories, occupants,
fuel, luggage and the drawbar noseweight, if
applicable). The gross vehicle weight rating is
specified on the vehicle identification plate on
the B-pillar on the driver's side.
Maximum loaded vehicle weight
The maximum weight is the sum of:
Rthe curb weight of the vehicle
Rthe weight of the accessories
Rthe load limit
Rthe weight of the factory installed optional
equipment
Kilopascal (kPa)
Metric unit for tire pressure. 6.9 kPa corre-
sponds to 1 psi. Another unit for tire pressure is
bar. 100 kilopascals (kPa) are the equivalent of
1 bar.
Load index
In addition to the load-bearing index, the load
index may also be imprinted on the sidewall of
the tire. This specifies the load-bearing capacity
more precisely.
Curb weight
The weight of a vehicle with standard equipment
including the maximum capacity of fuel, oil and
coolant. It also includes the air-conditioning sys- tem and optional equipment if these are instal-
led in the vehicle, but does not include passen-
gers or luggage.
Maximum load rating
The maximum tire load is the maximum permis-
sible weight in kilograms or lbs for which a tire is approved.
Maximum permissible tire pressure
Maximum permissible tire pressure for one tire.
Maximum load on one tire
Maximum load on one tire. This is calculated by
dividing the maximum axle load of one axle by
two.
PSI (pounds per square inch)
A standard unit of measure for tire pressure.
Aspect ratio
Relationship between tire height and tire widt h
in percent.
Tire pressure
This is pressure inside the tire applying an out-
ward force to each square inch of the tire's sur-
face. The tire pressure is specified in pounds per
square inch (psi), in kilopascal (kPa) or in bar.
The tire pressure should only be corrected when the tires are cold.
Cold tire pressure
The tires are cold:
Rif the vehicle has been parked with the tires
out of direct sunlight for at least three hours
and
Rif the vehicle has not been driven further than
1 mile (1.6 km)
Tread
The part of the tire that comes into contact with
the road.
Bead
The tire bead ensures that the tire sits securely
on the wheel. There are several steel wires in the
bead to prevent the tire from coming loose from
the wheel rim.
All about wheels and tires407
Wheels and tires
Z
Inflating the collapsible spare wheel
(Mercedes-AMG GLE 63)
!
Inflat eth ecollapsible spar ewhee lusin gth e
tire inflation compressor before lowering th e
vehicle. The whee lrim could otherwise be
damaged.
!Do no toperate th etire inflation compressor
for longer than eigh tminute sat atime without
a break. It may otherwise overheat.
The tire inflation compressor can be operate d
again once it has cooled down .
Comply wit hth emanufacturer' ssafet yinstruc-
tion son th etire inflation compressor label and
on th etire sealan tbottle.
XMoun tth ecollapsible spar ewhee las descri-
bed (Ypage 409).
The collapsible spar ewhee lmust be mounte d
before it is inflated.
XRemove th etire inflation compressor from
th estowage spac eunder th etrunk floor
(
Ypage 369).
XPull connecto r? and hos eB out of th e
housing .
XRemove th ecap from th evalv eon th ecol-
lapsible spar ewheel.
XScrew unio nnut ;of hos eB onto th evalve.
XMak esur eon/off switch Aof th etire infla-
tion compressor is set to 0.
XInsertconnecto r? into a socke tin your vehi-
cle .
Cigarette lighte rsocket: (
Ypage 342)
12 Vsockets : (
Ypage 343)
Observ eth enote son th ecigarette lighte r
(
Ypage 342). Observ eth enote son sockets
(Ypage 343).
XTurn th eSmartKey to position 1in th eignition
loc k (Ypage 145).
XPress on and off switch Aon th etire inflation
compressor to I.
The tire inflation compressor is switched on .
The tire is inflated. The tire pressur eis shown
on pressur egauge =.
XInflateth etire to th especifie dtire pressure.
The specifie dtire pressur eis printe don th e
yellow label of th eemergenc yspar ewheel.
XWhen th especifie dtire pressur ehas been
reached, press on and off switch Aon th e
tire inflation compressor to 0.
The tire inflation compressor is switched off .
XTurn theSmartKey to position 0in th eignition
lock.
XIf th etire pressur eis higher than th especifie d
pressure, press pressur erelease valv ebut -
to n: until th ecorrec ttire pressur ehas been
reached.
XUnscrew unio nnut ;on hos eB from th e
valve.
XScrew th ecap onto th evalv eof th ecollapsi-
ble spar ewhee lagain .
XStow connecto r? and hos eB in th elower
section of th etire inflation compressor.
XStow th etire inflation compressor in th evehi-
cle .
Emergency spare wheel429
Wheels and tires
Z
