tire size MERCEDES-BENZ SL CLASS 2019 Owners Manual

Labeling (overview) ........................ 307
Load bearing index (definition) ...... 312
Load index .....................................309
Load index (definition) ................... 312
M+S tires ....................................... 295
Maximum load on a tire (defini-
tion) ............................................... 312
Maximum loaded vehicle weight
(definition) ..................................... 312
Maximum permissible tire pres-
sure (definition) .............................312
Maximum tire load ......................... 310
Maximum tire load (definition) ....... 312
MOExtended tires .......................... 295
Optional equipment weight (defi-
nition) ............................................ 312
Overview ........................................ 293
PSI (pounds per square inch)
(definition) ..................................... 312
Replacing ....................................... 313
Service life ..................................... 294
Sidewall (definition) ....................... 312
Speed rating (definition) ................ 311
Storing ...........................................313
Structure and characteristics
(definition) ..................................... 311
Summer tires ................................. 295
Temperature .................................. 307
TIN (Tire Identification Number)
(definition) ..................................... 312
Tire bead (definition) ......................312
Tire pressure (definition) ................ 312
Tire pressures (recommended) ...... 311
Tire size (data) ............................... 318
Tire size designation, load-bear-
ing capacity, speed rating .............. 307
Tire tread ....................................... 294
Tire tread (definition) ..................... 312
Total load limit (definition) ............. 313
Traction ......................................... 306
Traction (definition) ....................... 312
Tread wear..................................... 306
Uniform Tire Quality Grading
Standards ...................................... 306
Uniform Tire Quality Grading
Standards (definition) .................... 311
Wear indicator (definition) ............. 313
Wheel and tire combination ........... 318
Wheel rim (definition) .................... 311
see Flat tire
Tow-starting
Emergency engine starting ............ 290
Important safety notes .................. 288
Towing
Permitted towing methods ............ 289
Towing away
Important safety guidelines ........... 288
Installing the towing eye ................ 288
Removing the towing eye ............... 289
Transporting the vehicle ................ 290
With both axles on the ground ....... 289
With the rear axle raised ................ 290
Traffic reports
see also Digital Operator's Man-
ual .................................................. 243
Traffic Sign Assist
Display message ............................ 222
Transmission
Overview of transmission posi-
tions .............................................. 134
Selector lever ................................ 134
see Automatic transmission
Transmission position display......... 135
Transporting the vehicle.................. 290
Trip computer (on-board com-
puter).................................................. 193
Trip odometer
Calling up ....................................... 193
Resetting (on-board computer) ...... 194
Trunk
Emergency release .......................... 86
Important safety notes .................... 81
Locking separately ........................... 86
Opening/closing (automatically
from inside) ...................................... 85
Opening/closing (automatically
from outside) ................................... 83
Opening/closing (from outside,
HANDS-FREE ACCESS) .................... 84
Opening/closing (manually from
outside) ............................................ 82
Overview .......................................... 81
Power closing .................................. 81
Trunk lid
Display message ............................ 230
Opening dimensions ...................... 326
20Index

Seat belt ........................................ 233
SPORT handling mode ................... 238
Tire pressure monitor .................... 242
Warning triangle................................ 276
Warranty.............................................. 25
Washer fluid
Display message ............................ 231
Weather display (COMAND)
see also Digital Operator's Man-
ual .................................................. 243
Wheel and tire combinations
Tires ............................................... 318
Wheel bolt tightening torque........... 317
Wheel chock...................................... 314
Wheels
Changing a wheel .......................... 313
Checking ........................................ 293
Cleaning ......................................... 274
Important safety notes .................. 293
Information on driving .................... 293
Interchanging/changing ................ 313
Mounting a new wheel ................... 316
Mounting a wheel .......................... 313
Overview ........................................ 293
Removing a wheel .......................... 316
Storing ........................................... 313
Tightening torque ........................... 317
Wheel size/tire size ....................... 318
Wind screen
Electrical wind screen ...................... 94
Windows
see Side windows
Windshield
Defrosting ...................................... 120
Windshield washer fluid
see Windshield washer system
Windshield washer system
Adding washer fluid ....................... 268
Important safety notes .................. 325
Windshield wipers
Display message ............................ 231
Problem (malfunction) ................... 115
Replacing the wiper blades ............ 114
Switching on/off........................... 113
Winter driving
Important safety notes .................. 295
Slippery road surfaces ................... 153
Snow chains .................................. 295
Winter operation
Overview ........................................ 295
Winter tires
M+S tires....................................... 295
Wiper blades
Cleaning ......................................... 274
Important safety notes .................. 114
Replacing ....................................... 114
Workshop
see Qualified specialist workshop
Z
ZONE function
Switching on/off........................... 120
22Index

Tire-change tool kit
The tire-change tool kit can be found in thestowage well under the trunk floor(Ypage 252).
CBag containing the tire-changing tools
BagCwith the tire-changing tools contains:
Rjack
Rlug wrench
Ralignment bolt
Rwheel chock
Rgloves
Depending on the equipment, tools requiredfor a wheel change, such as a jack or a lugwrench, are not available in all vehicles. Toolsapproved for your vehicle are available at aqualified specialist workshop.
Flat tire
Preparing the vehicle
Your vehicle may be equipped with:
Rtires with run-flat characteristics(MOExtended tires) (Ypage 278)
Vehicle preparation is not necessary onvehicles with MOExtended tires.
Ra TIREFIT kit (Ypage 277)
Vehicles with the Mercedes-Benz emer-gency call system:in the event of a flat tire,you can contact the Mercedes-Benz emer-gency call system customer center.
Vehicles equipped with MOExtended tires arenot equipped with a TIREFIT kit at the factory.It is therefore recommended that you addition-ally equip your vehicle with a TIREFIT kit if youmount tires that do not feature run-flat charac-teristics, e.g. winter tires. A TIREFIT kit may beobtained from a qualified specialist workshop.
Information on changing and mounting wheels(Ypage 313).
XStop the vehicle on solid, non-slippery andlevel ground, as far away as possible fromtraffic.
XSwitch on the hazard warning lamps.
XSecure the vehicle against rolling away(Ypage 146).
XIf possible, bring the front wheels into thestraight-ahead position.
XSwitch off the engine.
XVehicles without KEYLESS-GO:removethe SmartKey from the ignition lock.
XVehicles with KEYLESS-GO:open the driv-er's door.The vehicle electronics are now in positionZ. This is the same as the SmartKey havingbeen removed.
XVehicles with KEYLESS-GO:remove theStart/Stop button from the ignition lock(Ypage 126).
XMake sure that the passengers are notendangered as they do so. Make sure thatno one is near the danger area while awheel is being changed. Anyone who is notdirectly assisting in the wheel changeshould, for example, stand behind the bar-rier.
XGet out of the vehicle. Pay attention to traf-fic conditions when doing so.
XClose the driver's door.
MOExtended tires (tires with run-flat
properties)
General notes
With MOExtended tires (tires with run flatcharacteristics), you can continue to drive yourvehicle even if there is a total loss of pressurein one or more tires. The affected tire must notshow any clearly visible damage.
You can recognize an MOExtended tire by theMOExtended marking which appears on thesidewall of the tire. You will find this markingnext to the tire size designation, the load-bear-ing capacity and the speed index(Ypage 307).
MOExtended tires may only be used in con-junction with an active tire pressure monitor.
278Flat tire
Breakdown assistance

If a pressure loss warning messageappears in the multifunction display:
Robserve the instructions in the display mes-sages (Ypage 227)
Rcheck the tire for damage
Rif driving on, observe the following notes
The driving distance possible in run-flat modeis approximately 50 miles (80 kilometers)when the vehicle is partially laden and approx-imately 19 miles (30 kilometers) when thevehicle is fully laden.
In addition to the vehicle load, the driving dis-tance possible depends upon:
RVehicle speed
RRoad condition
ROutside temperature
The driving distance possible in run-flat modemay be reduced by extreme driving conditionsor maneuvers, or it can be increased through amoderate style of driving.
The driving distance possible in run-flat modeis counted from the moment the tire pressureloss warning appears in the multifunction dis-play.
You must not exceed a maximum designspeed of 50 mph (80 km/h).
When replacing one or all tires, please observethe following specifications for your vehicle'stires:
RSize
RType and
RThe "MOExtended" mark
If a tire has gone flat and cannot be replacedwith an MOExtended tire, a standard tire maybe used as a temporary measure. Make surethat you use the proper size and type (summeror winter tire).
Vehicles equipped with MOExtended tires arenot equipped with a TIREFIT kit at the factory.It is therefore recommended that you addition-ally equip your vehicle with a TIREFIT kit if youmount tires that do not feature run-flat charac-teristics, e.g. winter tires. A TIREFIT kit can beobtained from a qualified specialist workshop,for example.
Important safety notes
GWARNING
When you drive in emergency mode, the
handling characteristics are impaired. e.g.
when cornering, when accelerating strongly
and when braking. There is a risk of an acci-
dent.
Do not exceed the maximum specified
speed. Avoid any abrupt steering and driving
maneuvers as well as driving over obstacles
(curbs, pot holes, off-road). This applies, in
particular, to a loaded vehicle.
Stop driving in emergency mode if you
notice:
Rbanging noise
Rvehicle vibration
Rsmoke which smells like rubber
Rcontinuous ESP®intervention
Rcracks in the tire side walls
After driving in emergency mode, have the
rims checked by a qualified specialist work-
shop with regard to their further use. The
defective tire must be replaced in every
case.
TIREFIT kit
Important safety notes
TIREFIT is a tire sealant.
You can use TIREFIT to seal punctures of up to0.16 in (4 mm), particularly those in the tiretread. You can use TIREFIT at outside tempera-tures down to

Tire and Loading Information placard
CRecommended tire pressures
The Tire and Loading Information placard is onthe B-pillar on the driver's side (Ypage 303).
The Tire and Loading Information placard con-tains the recommended tire pressures for coldtires. The recommended tire pressures arevalid for the maximum permissible load and upto the maximum permissible vehicle speed.
Tire pressure table
The tire pressure table is on the inside of thefuel filler flap. It shows the tire pressure for alltires permitted at the factory for this vehicle;see illustration (example).
The tire pressure table contains the recom-mended pressures for cold tires for variousoperating conditions, i.e. differing load andspeed conditions.
If a tire size precedes a tire pressure, the fol-lowing tire pressure information is only validfor that tire size; see illustration (example).
The load conditions "partially laden" and "fullyladen" are defined in the table for differentnumbers of occupants and amounts of lug-gage. The actual number of seats may differ.
Some tire pressure tables show only the rimdiameters instead of the full tire size, e.g.R18.Rim diameter is part of the tire size and can befound on the tire sidewall (Ypage 307).
If the tire pressures have been set to the lowervalues for lighter loads and/or lower roadspeeds, the pressures should be reset to thehigher values:
Rif you want to drive with an increased loadand/or
Rif you want to drive at higher road speeds
The tire pressures for increased loads and/orhigher road speeds, shown in the tire pressuretable, may have a negative effect on drivingcomfort.
If the tire pressure is not set correctly, this canlead to an excessive build-up of heat and asudden loss of pressure.
For more information, contact a qualified spe-cialist workshop.
Tire pressure297
Wheels and tires
Z

Important safety notes
GWARNING
Each tire, including the spare (if provided),
should be checked at least once a month
when cold and inflated to the pressure rec-
ommended by the vehicle manufacturer on
the Tire and Loading Information placard on
the driver's door B-pillar or the tire pressure
label on the inside of the fuel filler flap. If
your vehicle has tires of a different size than
the size indicated on the Tire and Loading
Information placard or the tire pressure
label, you should determine the proper tire
pressure for those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitor-
ing system (TPMS) that illuminates a low tire
pressure telltale when one or more of your
tires are significantly underinflated. Accord-
ingly, when the low tire pressure telltale illu-
minates, you should stop and check your
tires as soon as possible, and inflate them to
the proper pressure. Driving on a signifi-
cantly underinflated tire causes the tire to
overheat and can lead to tire failure. Under-
inflation also reduces fuel efficiency and tire
tread life, and may affect the vehicle's han-
dling and stopping ability.
Please note that the TPMS is not a substi-
tute for proper tire maintenance, and it is
the driver's responsibility to maintain cor-
rect tire pressure, even if underinflation has
not reached the level to trigger illumination
of the TPMS low tire pressure telltale.
USA only:
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate if the
system is not operating properly. The TPMS
malfunction indicator is combined with the
low tire pressure telltale. When the system
detects a malfunction, the warning lamp will
flash for approximately a minute 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 illumina-
ted, the system may not be able to detect or
signal low tire pressure as intended. TPMS
malfunctions may occur for a variety of rea-
sons, including the mounting of incompati-
ble 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 tirepressure to that recommended for cold tireswhich is suitable for the operating situation(Ypage 296). Note that the correct tire pres-sure for the current operating situation mustfirst be taught-in to the tire pressure monitor.If a substantial loss of pressure occurs, thewarning threshold for the warning message isaligned to the taught-in reference values.Restart the tire pressure monitor after adjust-ing the pressure of the cold tires(Ypage 301). The current pressures aresaved as new reference values. As a result, awarning message will appear if the tire pres-sure drops significantly.
The tire pressure monitor does not warn you ofan incorrectly set tire pressure. Observe thenotes on the recommended tire pressure(Ypage 296).
The tire pressure monitor is not able to warnyou of a sudden loss of pressure, e.g. if thetire is penetrated by a foreign object. In theevent of a sudden loss of pressure, bring thevehicle to a halt by braking carefully. Avoidabrupt steering movements.
The tire pressure monitor has a yellow warninglamp in the instrument cluster for indicatingpressure loss or a malfunction. Whether thewarning lamp flashes or lights up indicateswhether a tire pressure is too low or the tirepressure monitor is malfunctioning:
Rif the warning lamp is lit continuously, thetire pressure on one or more tires is signifi-cantly too low. The tire pressure monitor isnot malfunctioning.
Rif the warning lamp flashes for approx-imately a minute and then remains lit con-
300Tire pressure
Wheels and ti res

CountryRadio type approval number
licence. L'exploitation estauthorisee aux deux conditionssuivantes. (1) L'appareil ne doitpas produire de brouillage, et(2) L'autisatuer de l'appareildoit accepter tout brouillageradioelectrique subi, meme si lebrouillage est susceptible d'encompromettre le fonctionne-ment. WARNING: Changes ormodifications not expresslyapproved by the party responsi-ble for compliance could voidthe user's authority to operatethe equipment. The term "IC:"before the radio certificationnumber only signifies Canadatechnical specifications weremet.
CanadaIC: 2546A-MW2433A
IC:2546A-GG4 This device com-plies with part 15 of the FCCrules and with license exemptRSS standards of Industry Can-ada. Operation is subject to thefollowing conditions. (1) Thisdevice may not cause harmfulinterference, and (2) This devicemust accept any interferencereceived, including interferencethat may cause undesired oper-ation. Le present appareil estconforme d'industrie Canadaapplicables aux appareils radioexempts de licence. L'exploita-tion est authorisee aux deuxconditions suivantes. (1) L'ap-pareil ne doit pas produire debrouillage, et (2) L'autisatuer del'appareil doit accepter toutbrouillage radioelectrique subi,meme si le brouillage est sus-ceptible d'en compromettre lefonctionnement. WARNING:Changes or modifications notexpressly approved by the partyresponsible for compliancecould void the user's authorityto operate the equipment. Theterm "IC:" before the radio cer-tification number only signifiesCanada technical specificationswere met.
CountryRadio type approval number
IC: 2546A-MC34MA4
Loading the vehicle
Instruction labels for tires and loads
GWARNING
Overloaded tires can overheat, causing a
blowout. Overloaded tires can also impair
the steering and driving characteristics and
lead to brake failure. There is a risk of acci-
dent.
Observe the load rating of the tires. The load
rating must be at least half of the GAWR of
your vehicle. Never overload the tires by
exceeding the maximum load.
Two instruction labels on your vehicle showthe maximum possible load.
(1) The Tire and Loading Information placardis on the B-pillar on the driver's side. TheTire and Loading Information placardshows the maximum permissible numberof occupants and the maximum permissi-ble vehicle load. It also contains details ofthe tire sizes and corresponding pressuresfor tires mounted at the factory.
(2) The vehicle identification plate is on theB-pillar on the driver's side. The vehicleidentification plate informs you of thegross vehicle weight rating. It is made upof the vehicle weight, all vehicle occu-pants, the fuel and the cargo. You can alsofind information about the maximum grossaxle weight rating on the front and rearaxle.
The maximum gross axle weight rating isthe maximum weight that can be carriedby one axle (front or rear axle). Neverexceed the maximum load or the maxi-mum gross axle weight rating for the frontor rear axle.
Loading the vehicle303
Wheels and tires
Z

available cargo and luggage load capacity is650 lbs (1400 - 750 (5 x 150) = 650 lbs).
XStep 5:Determine the combined weight ofluggage and cargo being loaded on the vehi-cle. That weight may not safely exceed theavailable cargo and luggage load capacitycalculated in step 4.
Example: steps 1 to 3
The following table shows examples on how tocalculate total and cargo load capacities withvarying seating configurations and number andsize of occupants. The following examples usea load limit of 1500 lbs (680 kg).This is forillustration purposes only.Make sure youare using the actual load limit for your vehiclestated on your vehicle's Tire and Loading Infor-mation placard (Ypage 303).
The greater the combined weight of the occu-pants, the lower the maximum luggage load.
Step 1
Example 1Example 2
Combined max-imum weightof occupantsand cargo(data from theTire and Load-ing Informa-tion placard)
1500 lbs(680 kg)1500 lbs(680 kg)
Step 2
Example 1Example 2
Number of peo-ple in the vehi-cle (driver andoccupants)
12
Weight of theoccupantsOccu-pant 1:175 lbs(80 kg)
Occu-pant 1:175 lbs(80 kg)
Occu-pant 2:195 lbs(88 kg)
Gross weightof all occu-pants
175 lbs(80 kg)370 lbs(168 kg)
Step 3
Example 1Example 2
Permissibleload (maxi-mum grossvehicle weightrating fromthe Tire andLoading Infor-mation plac-ard minus thegross weightof all occu-pants)
1500 lbs(680 kg)

Summertires
IndexSpeed rating
ZR...(..Y)over 186 mph (300 km/h)
ZRover 149 mph (240 km/h)
ROptionally, tires with a maximum speed ofover 149 mph (240 km/h) may have "ZR" inthe size description, depending on the man-ufacturer (e.g. 245/40 ZR18).
The service specification is made up of load-bearing index

wall of the tire. You will find this after the let-ter that identifies the speed rating(Ypage 307).
RIf no specification is given: no text (as in theexample above), represents a standard load(SL) tire
RXL or Extra Load: represents a reinforcedtire
RLight Load: represents a light load tire
RC, D, E: represents a load range thatdepends on the maximum load that the tirecan carry at a certain pressure
iTire data is vehicle-specific and may devi-ate from the data in the example.
Maximum load rating
Maximum tire loadCis the maximum permis-sible weight for which the tire is approved.
Do not overload the tires by exceeding thespecified load limit. The maximum permissibleload can be found on the vehicle's Tire andLoading Information placard on the B-pillar onthe driver's side (Ypage 303).
iThe actual values for tires are vehicle-spe-cific and may deviate from the values in theillustration.
DOT, Tire Identification Number (TIN)
US tire regulations stipulate that every tiremanufacturer or retreader must imprint a TINin or on the sidewall of each tire produced.
The TIN is a unique identification number. TheTIN enables the tire manufacturers or retread-ers to inform purchasers of recalls and othersafety-relevant matters. It makes it possiblefor the purchaser to easily identify the affectedtires.
The TIN is made up of manufacturer identifica-tion codeD, tire size