2014 MERCEDES-BENZ CLS tire size

Example: tire pressure table with tire dimensions
Ifatire size precedesatire pressure, the tire
pressure informationfollowing is only valid
for that tire size. The load conditions "partially
laden" and "fully laden" are defined in the
table for different numbers of occupantsand
amounts of luggage. The actual number of
seats may differ.
Some tire pressure tables show only the rim
diameters instead of the full tire size, e.g.
R18.The rim diameter is part of the tire size
and can be found on the tire sidewall
(Ypage 351).
If the tire pressures have been set to the
lower values for lighter loads and/or lower
road speeds, the pressures should be reset
to the higher values:
Rif you want to drive with an increased load
and/or
Rif you want to drive at higher road speeds.
iThe tire pressures for increased loads
and/or higher road speeds, shown in the
tire pressure table, may haveanegative
effect on driving comfort.
If the tire pressure is not set correctly, this
can lead to an excessive build up of heat and
asudden loss of pressure.
For more information, contactaqualified
specialist workshop.
Important notes on tire pressure
GWARNING
If the tire pressure drops repeatedly, the
wheel, valve or tire may be damaged. Tire
pressure that is too low may result inatire
blow-out. There isarisk of an accident.
RCheck the tire for foreign objects.
RCheck whether the wheel is losing air or the
valve is leaking.
If you are unable to rectify the damage,
contactaqualified specialist workshop.
GWARNING
If you fit unsuitable accessories onto tire
valves, the tire valves may be overloaded and
malfunction, which can cause tire pressure
loss. Due to their design, retrofitted tire
pressure monitors keep the tire valve open.
This can also result in tire pressure loss. There
isarisk of an accident.
Only screw the standard valve cap or other
valve caps approved by Mercedes-Benz for
your vehicle onto the tire valve.
Useasuitable pressure gauge to check the
tire pressure. The outer appearance ofatire
does not permit any reliable conclusion about
the tire pressure. On vehicles equipped with
the electronic tire pressure monitoring
system, the tire pressure can be checked
using the on-board computer.
The tire temperature and pressure increase
when the vehicle is in motion.This is
dependent on the driving speed and the load.
Therefore, you should only correct tire
pressures when the tires are cold.
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Wheels and tires
Z

Example: current tire pressure display
Important safety notes
GWARNING
Each tire,including the spare (ifprovided),
should be checked at least once every two
weeks when cold and inflated to the pressure
recommended by the vehiclemanufacturer
on the Tire and Loading Information placard
on the driver'sdoor B-pillar or the tire
pressure label on the inside of the fuel filler
flap.Ifyour vehicle has tires ofadifferent size
than the size indicated on the Tire and Loading
Information placard or, if available, the tire
pressure label, you should determinethe
proper tire pressure for those tires.
As an added safety feature, your vehicle has
been equipped withatire pressure monitoring
system (TPMS) that illuminatesalow tire
pressure telltale when one or more of your
tires are significantly underinflated.
Accordingly, when the low tire pressure
telltale lights up, you should stop and check
your tires as soon as possible, and inflate
them to the proper pressure. Drivingona
significantly underinflated tire causes the tire
to overheat and can lead to tire failure.
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the vehicle's
handling and stopping ability. Please note that
the TPMS is notasubstitute for proper tire
maintenance, and it is the driver's
responsibility to maintain correcttire
pressure, even if underinflation has not
reached the level to trigger illumination of the
TPMS low tire pressure telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate when
the system is not operating properly. The
TPMS malfunction indicator is combined with
the low tire pressure telltale. When the
system detectsamalfunction, the warning
lamp will flash for approximatelyaminute and
then remain continuously illuminated. This
sequence will be repeated every time the
vehicle is started as long as the malfunction
exists. When the malfunction indicator is
illuminated, the system may not be able to
detect or signal low tire pressure as intended.
TPMS malfunctions may occur foravariety of
reasons, including the installation of
incompatible replacement or alternate tires
or wheels on the vehicle that prevent the
TPMS from functioning properly. Always
check the TPMS malfunction telltale after
replacing one or more tires or wheels on your
vehicle to ensure that the replacement or
alternate Tires and wheels allow the TPMS to
continue to function properly.
It is the driver's responsibility to set the tire
pressure to that recommended for cold tires
which is suitable for the operating situation
(Ypage 338). Note that the correcttire
pressure for the current operating situation
must first be taught-in to the tire pressure
monitor. If there isasubstantial loss of
pressure, the warning threshold for the
warning message is aligned to the reference
values taught-in.Restart the tire pressure
monitor after adjustingthe pressure of the
cold tires (Ypage 345). The current
pressures are saved as new reference values.
Asaresult,awarning message will appear if
the tire pressure drops significantly.
The tire pressure monitor does not warn you
of an incorrectly set tire pressure. Observe
the notes on the recommended tire pressure
(Ypage 338).
The tire pressure monitor is not able to warn
you ofasudden loss of pressure, e.g. if the
tire is penetrated byaforeign object. In the
event ofasudden loss of pressure, bring the
vehicle toahalt by brakingcarefully. Avoid
sudden steering movements
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Wheels and tires
Z

details of the tire sizes and
correspondingpressures for tires
mounted at the factory.
(2) The vehicle identification plate is on the
B-pillar on the driver'sside. The vehicle
identification plate informsyou of the
gross vehicle weight rating. It is made up
of the vehicle weight, all vehicle
occupants, the fuel and the cargo. You
can also find information about the
maximum gross axle weight rating on the
front and rear axle.
The maximum gross axle weight rating is
the maximum weight that can be carried
by one axle (front or rear axle). Never
exceed the maximum load or the
maximum gross axle weight rating for the
front or rear axle.
B-pillar, driver's side
Maximumpermissible grossvehicle
weight rating
XSpecification for maximum gross vehicle
weightis listed in theTire and Loading
Information placard: "The combinedweight
of occupantsand cargo should never
exceed XXX kilogramsorXXX lbs."
The gross weight of all vehicle occupants,
load and luggage must notexceedthe
specified value.
iThe specifications shown on the Tire and
Loading Informationplacard in the
illustrationare examples. The maximum
permissible gross vehicleweight rating is
vehicle-specific and may differ from that in
the illustration. You can find the valid
maximumpermissible gross vehicle weight
ratingfor your vehicle on the Tire and
Loading Information placard.
Number of seats
Maximum number of seatsindicates the
maximum number of occupants allowed to
travel in the vehicle. This information can be
found on the Tire and Loading Information
placard.
iThe specifications shown on the Tire and
Loading Information placard in the
illustration are examples. The number of
seats is vehicle-specific and can differ from
the details shown. The number of seats in
your vehicle can be found on the Tire and
Loading Information placard.
346Loading thevehicle
Wheels and tires

Example: steps1to3
The followingtable showsexamples on how to calculate total and cargo load capacities with
varying seating configurations and number and sizeofoccupants. The followingexamples use
amaximum load of 1500 lbs (680kg).This is forillustration purposes only.Make sure you
are using the actual load limit for your vehicle stated on your vehicle's Tire and Loading
Information placard (Ypage 345).
The greater the combined weight of the occupants, the lower the maximum luggage load.
Step 1
Example 1Example 2Example 3
Combined maximum
weight of occupants
and cargo(datafrom
theTireand Loading
Information placard)
1500lbs (680 kg)1500lbs (680 kg)1500lbs (680 kg)
Step 2
Example 1Example 2Example 3
Number of people in
thevehicle (driver
and occupants)
531
Distribution of the
occupants
Front:2
Rear: 3
Front:1
Rear: 2
Front:1
Weight of the
occupants
Occupant 1:
150 lbs (68 kg)
Occupant 2:
180 lbs (82 kg)
Occupant 3:
160 lbs (73 kg)
Occupant 4:
140 lbs (63 kg)
Occupant 5:
120 lbs (54 kg)
Occupant 1:
200 lbs (91 kg)
Occupant 2:
190 lbs (86 kg)
Occupant 3:
150 lbs (68 kg)
Occupant 1:
150 lbs (68 kg)
Gross weight of all
occupants
750 lbs (340 kg)540 lbs (245 kg)150 lbs (68 kg)
348Loading thevehicle
Wheels and tires

Tire labeling
Overview
UniformTire QualityGrading Standard
(Ypage 355)
DOT, Tire Identification Number
(Ypage 354)
$Maximum tireload (Ypage 353)
!Maximum tirepressure (Ypage 340)
Manufacturer
%Tire material (Ypage 354)
Tire size designation,load-bearing
capacity and speed index (Ypage 351)
Load index (Ypage 353)
Tire name
The markings described above are on the tire
in additiontothe tire name (sales
designation) and the manufacturer's name.
iTire data is vehicle-specific and may
deviate from the data in the example.
Tire size designation, load-bearing
capacity and speed rating
GWARNING
Exceeding the stated tire load-bearing
capacity and the approved maximum speed
could lead to tire damage or the tire bursting.
There isarisk of accident.
Therefore, only use tire types and sizes
approved for your vehicle model. Observe the
tire load rating and speed rating required for
your vehicle.
Tire width
Nominal aspect ratio in %
$Tire code
!Rim diameter
Load bearing index
%Speed rating
General:depending on the manufacturer's
standards, the size imprinted in the tire wall
may not contain any letters or may contain
one letter that precedes the size description.
If there is no letter preceding the size
description (as shown above): these are
passenger vehicle tires according to
European manufacturingstandards.
If "P" precedes the size description:these are
passenger vehicle tires according to U.S.
manufacturing standards.
If "LT" precedes the size description: these
are light truck tires according to U.S.
manufacturing standards.
If "T" precedes the size description: these are
compact emergency spare wheels at high tire
pressure, to be used only temporarily in an
emergency.
Tire width:tire widthshows the nominal
tire width in millimeters.
Aspect ratio:aspect ratiois the size ratio
between the tire height and tire width and is
shown in percent.The aspect ratio is
All about wheels and tires351
Wheels and tires
Z

calculatedbydividing the tire width by the tire
height.
Tire code:tire code$specifies the tire type.
"R"represents radialtires; "D" represents
diagonaltires; "B" represents diagonalradial
tires.
Optionally, tireswithamaximum speed of
over149 mph (240 km/h)may have "ZR" in
the size description, depending on the
manufacturer (e.g. 245/40 ZR 18).
Rim diameter:rim diameter!is the
diameter of the beadseat, not the diameter
of the rim flange. The rim diameter is
specified in inches(in).
Load-bearingindex:load-bearing index
isanumericalcode that specifies the
maximum load-bearing capacity ofatire.
Do not overload the tiresbyexceedingthe
specified load limit. The maximum
permissibleload can be found on the
vehicle's Tireand LoadingInformation
placard on theB-pillar on thedriver's side
(Ypage 345).
Example:
Load-bearingindex 91 indicatesamaximum
load of 1356 lb (615kg)that thetires can
bear.Forfurther information on themaximum
tireload in kilograms and lbs, see
(Ypage 353).
For further informationontheload bearing
index,see "Load index"(Ypage 353).
Speed rating:speedrating%specifiesthe
approved maximum speedofthetire.
iTire dataisvehicle-specific and may
deviate from thedataintheexample.
Regardless of thespeedrating,always
observethespeedlimits. Drive carefullyand
adapt your driving style to thetraffic
conditions.
Summer tires
IndexSpeed rating
Qup to 100mph (160km/h)
Rup to 106mph (170km/h)
IndexSpeed rating
Sup to 112mph (180km/h)
Tup to 118mph (190km/h)
Hup to 130mph (210km/h)
Vup to 149mph (240km/h)
Wup to 168mph (270km/h)
Yup to 186mph (300km/h)
ZR...Yup to 186mph (300km/h)
ZR...(..Y)over186mph (300km/h)
ZRover149mph (240km/h)
ROptionally, tires withamaximum speedof
over149mph (240km/h) may have "ZR"
in thesizedescription,dependingonthe
manufacturer (e.g. 245/40 ZR18).
The servicespecificationismade up of
load-bearing indexand speed rating
%.
RIf the size description of your tire includes
"ZR"and there are no service
specifications, ask the tire manufacturer in
order to find out the maximum speed.
Ifaservice specification is available, the
maximum speed is limited according to the
speed rating in the service specification.
Example: 245/40ZR18 97Y.In this
example, "97 Y" is the service specification.
The letter "Y" represents the speed rating.
The maximum speed of the tire is limited to
186 mph (300 km/h).
RThe size descriptionfor all tires with
maximum speeds of over 186 mph
(300 km/h) must include "ZR",andthe
service specification must be given in
parentheses. Example:
275/40 ZR 18 (99 Y). Speed rating "(Y)"
indicates that the maximum speed of the
tire is over 186 mph (300 km/h).Ask the
tire manufacturer about the maximum
speed.
352All about wheelsand tires
Wheels and tires

Do not overloadthe tires by exceeding the
specifiedloadlimit.Themaximum
permissibleloadcan be found on the
vehicle'sTireand Loading Information
placard on the B-pillar on the driver's side
(Ypage 345).
iTheactual values for tires arevehicle-
specific and maydeviate fromthe values in
the illustration.
DOT, Tire Identification Number (TIN)
U.S. tire regulations prescribe that every tire
manufacturer or retreader must imprintaTIN
in or on the sidewall of every tire produced.
The TIN isauniqueidentification number. The
TIN enables the tire manufacturers or
retreaders to inform purchasers of recallsand
other safety-relevant matters. It makes it
possible for the purchaser to easily identify
the affected tires.
The TIN is made up of manufacturer
identification code,tire size$,tire type
code!and manufacturing date.
DOT (Department of Transportation):tire
symbolindicates that the tire complies
with the requirements of the U.S. Department
of Transportation.
Manufacturer identification code:
manufacturer identification codeprovides
detailsonthe tire manufacturer. New tires
haveacode with two symbols. Retreaded
tires haveacode with four symbols.
For further information aboutretreaded tires,
see (Ypage 334).
Tiresize:identifier$describes the tire size.
Tiretypecode:tire type code!can be used
by the manufacturer asacode to describe
specific characteristics of the tire.
Date of manufacture:date of manufacture
provides information about the age of a
tire. The first and second positions represent
the week of manufacture, starting with "01"
for the first calendar week. Positions three
and four represent the year of manufacture.
For example,atire that is marked with
"3208", was manufactured in week 32 in
2008.
iTire data is vehicle-specific and may
deviate from the data in the example.
Tire characteristics
This information describes the type of tire
cord and the number of layers in
sidewalland under tire tread.
iTire data is vehicle-specific and may
deviate from the data in the example.
Definition of termsfor tires and loading
Tire ply composition and material used
Describes the number of plies or the number
of layers of rubber-coated fabric in the tire
tread and sidewall. These are made of steel,
nylon, polyester and other materials.
Bar
Metric unit for tire pressure.
14.5038 pounds per square inch (psi) and
354All about wheelsand tires
Wheels and tires

Curbweight
The weight ofavehicle with standard
equipment includingthemaximum capacity
of fuel, oil and coolant.Italso includes the air-
conditioningsystem and optional equipment
if these are installed in the vehicle, but does
not include passengers or luggage.
Maximumload rating
The maximum tireload is the maximum
permissible weight in kilograms or lbs for
whichatireisapproved.
Maximumpermissible tirepressure
Maximum permissible tirepressure for one
tire.
Maximumload on one tire
Maximum load on one tire. This is calculated
by dividingthe maximum axle load of one axle
by two.
PSI (pounds per squareinch)
Astandardunitofmeasure for tire pressure.
Aspect ratio
Relationship between tire height and tire
width in percent.
Tirepressure
This is pressure inside the tire applying an
outward forcetoeach square inch of the tire's
surface. 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 tirepressure
The tires are cold:
Rif the vehicle has been parked without
direct sunlight on the tires for at least three
hours and
Rif the vehicle has been driven for less than
1mile (1.6 km).
Tread
The part of the tire that comes intocontact
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 preventthe tire from
comingloose from the wheel rim.
Sidewall
The part of the tire between the tread and the
bead.
Weight of optional extras
The combined weight of those optional extras
that weigh more than the replaced standard
parts and more than 2.3 kilograms (5 lbs).
These optional extras, such as high-
performance brakes, level control,aroof rack
orahigh-performancebattery, are not
included in the curb weight and the weight of
the accessories.
TIN (Tire Identification Number)
This isaunique identifier which can be used
byatire manufacturer to identify tires, for
example foraproduct recall, and thus identify
the purchasers. The TIN is made up of the
manufacturer's identity code, tire size, tire
type code and the manufacturing date.
Load bearing index
The load bearing index (also load index) is a
code that contains the maximum load bearing
capacity ofatire.
Traction
Traction is the result of friction between the
tires and the road surface.
Treadwear indicators
Narrow bars (tread wear bars) that are
distributed over the tire tread. If the tire tread
is level with the bars, the wear limit ofin
(1.6 mm) has been reached.
356All about wheels and tires
Wheels and tires