2018 MERCEDES-BENZ SLC ROADSTER wheel

Avoidtire pressures thata retoo high in al lthe
tires, including the spare wheel.
Overinflated tire smay:
Rincrease the braking distance
Radversel yaffect handling
Rwear excessivel yand/or unevenly
Rhave an adverse effect on rid ecomfort
Rbe more susceptibl etodamage
Maximum tire pressures
:Example: maximu mpermissibl etire pres-
sure
Never exceed the maximu mpermissibl etire
inflation pressure. Alway sobserve the recom-
mended tire pressure for your vehicl ewhen
adjusting the tire pressure (
Ypage 263).
iThe actual values for tire sarevehicle-spe-
cifi cand mayd eviate from the values in the
illustration.
Checkin gthe tire pressures
Important safety notes
The tire pressure monitor does not warn yo uof:
Rincorrectly set tire pressure
Rsudden loss of tire pressure, e.g .from afor-
eign object thath aspenetrated the tire
Observ ethe notes on tire pressure
(
Ypage 263). Informatio
nonairpressure for the tire sonyour
vehicl ecan be found:
Ron the vehicle's Tire and Loading Information
placard on the B-pillar
Ron the tire pressure table in the fuel fille rflap
Rin the "Tire pressure" section
Checkin gtire pressuresm anually
To determine and set the correct tire pressure,
proceedasfollows:
XRemove the valve cap of the tire thati stobe
checked.
XPress the tire pressure gaug esecurel yonto
the valve.
XRead the tire pressure and compar eittothe
recommende dvalue on the Tire and Loading
Informatio nplacard or the tire pressure table
(
Ypage 263).
XIf the tire pressure is too low, increase the tire
pressure to the recommende dvalue.
XIf the tire pressure is too high, release air. To
do so, press down the meta lpinin the valve,
using the tip of apen for example. The ncheck
the tire pressure agai nusing the tire pressure
checker.
XScrew the valve cap onto the valve.
XRepeat thes estepsf or the othe rtires.
Tire pressure loss warning system
(Canada only)
General notes
While the vehicl eisinmotion, the tire pressure
loss warning system monitors the set tire pres-
sure using the rotational speed of the wheels.
Thi senables the system to detect significant
pressure loss in atire .Ift he speed of rotatio nof
aw heel changesasa resultofa loss of pressure,
ac orresponding warning message will appear in
the multifunctio ndisplay.
Yo uc an recognize the tire pressure loss warning
by the Run FlatI ndicator Active Press
'OK'toRestartmessage which appear sin
the Serv.menu of the multifunctio ndisplay.
Informatio nonthe message display can be
found in the "Restarting the tire pressure loss
warning system "sectio n(
Ypage 267).
266Tire pressure
Wheel sand tires

Important safety notes
The tire pressurewarning system does no twarn
you of an incorrectl yset tire pressure. Observ e
th en otes on th erecommended tire pressur e
(
Ypage 263).
The tire pressur eloss warning does no treplace
th en eedtor egularly chec kthe tire pressure. An
eve nloss of pressur eonseveral tires at th e
sam etimec anno tbed etecte dbythetire pres-
sur eloss warning system.
The tire pressur emonitor is no table to warn you
of as udde nloss of pressure, e.g. if th etirei s
penetrated by aforeign object. In th eevent of a
sudde nloss of pressure, brin gthe vehicl etoa
halt by braking carefully. Avoid abrup tsteering
movements.
The function of th etirep ressur eloss warning
system is limite dordelayedif:
Rsnow chain sare mounte donyour vehicle's
tires .
Rroad condition sare wintry.
Ryou are driving on san dorgravel.
Ryou adopt averys port ydriving style (corner-
ing at high speeds or driving wit hhigh rates of
acceleration).
Ryou driv ewithah eavyload.
Restarting th etirep ressure loss warn-
ing system
Restart th etirep ressur eloss warning system if
you have :
Rchanged th etirep ressur e
Rchanged th ewheels or tires
Rmounte dnew wheels or tires
XBefore restarting ,makes uret hatthe tire
pressures are set properly on all four tires for
th er espective operating conditions.
The recommended tire pressur ecan be foun d
on th eTirea nd Loading Information placard
on th eB-pillar .Additionally, atirep ressur e
table is attached to th efuel filler flap .The tire
pressur eloss warning system can only giv e
reliable warning sifyou have set th ecorrect
tire pressure. If an incorrec ttirep ressur eis
set ,the se incorrec tvalue swill be monitored.
XAlsoo bserv ethe note sint hesection on tire
pressures (Ypage 263).
XMakesuret ha tthe SmartKey is in position 2
in th eignition loc k(Ypage 116).
XPress the= or; buttononthesteering
whee ltos elect th eServ.menu.
XPress th e9 or: buttontos elect
Tir ePressure.
XPress th ea button.
The Run Fla tIndicator Active Press
'OK'toR estartmessage appear sinthe
multifunction display.
If you wish to confirm th erestart :
XPress th ea button.
The TirePressure Now OK?message
appear sinthemultifunction display.
XPress th e9 or: buttontos electYes.
XPress th ea button.
The Run Fla tIndicator Restartedmes -
sage appear sinthemultifunction display.
Afte rateach-in period, th etirep ressur eloss
warning system will monitor th eset tire pres-
sures of all four tires .
If you wish to cancel th erestart :
XPress th e% button.
or
XIf th eTir ePressure Now OK?message
appears, use th e9 or: buttonto
select Cancel
.
XPress th ea button.
The tire pressur evalue sstoredatt helast
restar twill continue to be monitored.
Tire pressure monitor
General notes
If at irep ressur emonitor is installed, th evehi-
cle's wheels hav esensor sthatm onitor th etire
pressures in all four tires .The tire pressur emon-
itor warn syou if th epressur edrops in on eor
mor eoft hetires .The tire pressur emonitor only
function sifthecorresponding sensor sare
installed in all wheels.
Information on tire pressures is displayed in th e
multifunction display. Afte rafew minute sof
driving ,the curren ttirep ressur eofeacht irei s
shown in th eServ.
men uoft hemultifunction
display.
Tire pressure267
Wheels and tires
Z

Example: current tire pressure display
For informationonthe message display, refer to
the "Checking the tire pressure electronically"
sectio n(
Ypage 269).
Important safety notes
GWARNING
Each tire ,including the spar e(ifprovided),
shoul dbec hecked at leas tonce amonth
when col dand inflate dtothe pressure rec-
ommended by the vehicl emanufacturer on
the Tire and Loading Informatio nplacard on
the driver's door B-pillar or the tire pressure
labe lont he insid eofthe fuel fille rflap. If your
vehicl ehastire sofad ifferent size thant he
size indicated on the Tire and Loading Infor-
matio nplacard or the tire pressure label, you
shoul ddetermine the prope rtire pressure for
thos etires.
As an adde dsafety feature, your vehicl ehas
been equipped with atire pressure monitoring
system (TPMS )thati llum inate salowtire pres-
sure telltale when one or mor eofyourtires
ar es ignificantl yunderinflated .Accordingly,
when the lo wtire pressure telltale illuminates,
yo us houl dstop and check your tire sassoon
as possible, and inflate themtot he proper
pressure. Driving on asignificantl yunderin-
flated tire causes the tire to overheat and can lead to tire failure. Underinflatio nalso
reduce sfue lefficiency and tire trea dlife, and
maya ffect the vehicle's handling and stop-
ping ability.
Please note thatt he TPMS is notasubst itute
for prope rt
ire ma
intenance ,and it is the driv-
er' sresponsibility to maintain correct tire
pressure, eve nifunderinflatio nhasnot
reachedt he level to triggeri llumination of the
TPMS lo wtire pressure telltale.
Your vehicl ehasalso been equipped with a
TPMS malfunctio nindicator to indicate if the
system is not operating properly .The TPMS
malfunctio nindicator is combine dwitht he
lo wt ire pressure telltale .Whent he system
detects amalfunction, the warning lamp will
flash for approximately aminute and then
remai ncontinuously illuminated. This
sequence will be repeated every time the vehi-
cle is started as long as the malfunction
exists.
When the malfunctio nindicator is illuminated,
the system mayn ot be able to detect or signal
lo wt ire pressure as intended. TPMS malfunc-
tions mayo ccurfor av ariety of reasons,
including the installatio nofincompatible
replacement or alternate tire sorwheelson
the vehicl ethatp revent the TPMS fromf unc-
tioning properly .Alway scheck the TPMS mal-
functio ntelltale after replacing one or more
tire sorw heelsony ourvehicl etoe nsurethat
the replacement or alternate tire sand wheels
allo wthe TPMS to continue to functio nprop-
erly.
It is the driver's responsibility to set the tire
pressure to thatr ecommendedfor col dtires
which is suitabl efor the operating situation
(
Ypage 263).N ote thatthe correct tire pressure
for the current operating situatio nmustfirst be
taught-i ntothe tire pressure monitor. If asub-
stantia llos sofp ressure occurs, the warning
threshold for the warning message is aligned to
the taught-i nreference values. Restart the tire
pressure monitor after adjusting the pressure of
the col dtires(
Ypage 270). The current pres-
sures ar esaved as new reference values. As a
result, awarning message will appear if the tire
pressure drops significantly.
The tire pressure monitor does not warn yo uof
an incorrectly set tire pressure. Observe the
note sont he recommende dtire pressure
(
Ypage 263).
The tire pressure monitor is not able to warn you
of as udde nlossofp ressure, e.g .ifthe tire is
penetrated by aforeign object. In the event of a
sudden loss of pressure, bring the vehicl etoa
halt by braking carefully. Avoi dabrup tsteering
movements.
268Tire pressure
Wheel sand tires

The tire pressure monitor hasayellow warning
lamp in the instrument cluster for indicating
pressure loss or amalfunction. Whether the
warning lamp flashes or lights up indicates
whether atire pressure is too low or the tire
pressure monitor is malfunctioning:
Rif the warning lamp is lit continuously, the tire
pressure on one or more tires is significantly
too low. The tire pressure monitor is not mal- functioning.
Rif the warning lamp flashes for approximately
am inute and then remains lit constantly, the
tire pressure monitor is malfunctioning.
In addition to the warning lamp, amessage
appears in the multifunction display.O bserve
the information on display messages
(
Ypage 196).
It may take up to ten minutes for amalfunction
of the tire pressure monitor to be indicated. A
malfunction will be indicated by the tire pres-
sure warning lamp flashing for approximately
one minute and then remaining lit. When the
malfunction has been rectified, the tire pressure
warning lamp goes out after afew minutes of
driving.
The tire pressure values indicated by the on-
board computer may differ from those meas-
ured at agas station with apressure gage. The
tire pressures shown by the on-board computer
refer to those measured at sea level. At high
altitudes, the tire pressure values indicated by a pressure gage are higher than those shown by
the on-board computer. In this case, do not
reduce the tire pressures.
The operation of the tire pressure monitor can
be affected by interferenc efrom radio transmit-
ting equipment (e.g. radio headphones, two-way
radios) that may be being operated in or near the vehicle.
Checking the tire pressur eelectroni-
cally
XMake sure that the SmartKey is in position 2
(Ypage 116) in the ignition lock.
XPress the =or; button on the steering
wheel to select the Serv.menu.
XPress the9or: button to select
Tire Pressure.
XPress a.
The current tire pressure of each tire is shown
in the multifunction display. If the vehicle has been parked for over
20 minutes, the
Tire pressure will be
displayed after driving afew minutesmessage appears.
After ateach-in process, the tire pressure mon-
itor automatically detect snew wheels or new
sensors. As long as aclear allocation of the tire
pressure value to the individual wheels is not
possible, the Tire
PressureMonitorActivedisplay message is shown instead of the tire
pressure display.T he tire pressures are already
being monitored.
If an emergencys pare wheel is mounted, the
system may continue to show the tire pressure
of the wheel that has been removed for afew
minutes. Be aware that the value displayed for
the position where the emergencys pare wheel
is fitted is not the same as the current tire pres-
sure of the emergencys pare wheel.
Tire pressuremonitor warning mes-
sages
The tire pressure monitor detect sapressure
loss in one or more tires:
RIf the tire pressure monitor detect sapressure
loss in one or more tires, awarning message
is shown in the multifunction display.T he yel-
low tire pressure warning lamp then lights up.
RIf the Please Correct Tire Pressuremessage appears in the multifunction display,
the tire pressure in at least one tire is too low.
The tire pressure must be corrected when the
opportunit yarises.
RIf the Check Tiresmessage appears in the
multifunction display,t he tire pressure in at
least one tire has dropped significantly. The
tires must be checked.
RIf the WarningTireMalfunctionmessage
appears in the multifunction display,t he tire
pressure in at least one tire has dropped sud-
denly. The tires must be checked.
Observe the instructions and safety notes in the
display messages in the "Tires" section
(
Ypage 196).
If the wheel positions on the vehicle are rotated,
the tire pressures may be displayed for the
wrong positions for ashort time. This is rectified
after afew minutes of driving, and the tire pres-
sures are displayed for the correctp ositions.
Tirepressure269
Wheels and tires
Z

Restarting the tire pressure monitor
Whenyourestart the tire pressure monitor, all
existing warning messages are deleted and the
warning lamps go out. The monitor uses the cur-
rentlys et tire pressures as the reference values
for monitoring. In most cases, the tire pressure
monitor will automaticall ydetect the new refer-
ence value safteryou have changed the tire
pressure. However, yo ucan also set reference
value smanually as described here. The tire
pressure monitor then monitors the new tire
pressure values.
XSet the tire pressure to the value recommen-
ded for the corresponding driving situation on
the Tire and Loading Information placard on
the driver'ss ideB -pillar (
Ypage 263).
Additiona ltire pressure value sfor different
load scan also be found on the tire pressure
table on the inside of the fue lfille rflap
(
Ypage 263).
XMake sure that the tire pressure is correct on
al lf ourw heels.
XEnsur ethat the SmartKey is in position 2in
the ignition lock.
XPress the =or; button on the steering
wheel to select the Serv.menu.
XPress the9or: button to select
Tire Pressure.
XPress a.
The multifunction display shows the current
tire pressure for the individual tire sorthe
Tire pressure will be displayed
afterd rivingafew minutesmessage.
XPress the :button.
The UseCurrentPressuresasNewRef‐erenceValuesmessage appears in the mul-
tifunction display.
If you wish to confirm the restart:
XPress a.
The TirePress.MonitorRestartedmes-
sage appears in the multifunction display.
After driving for afew minutes, the system
checks whethert he current tire pressures are
within the specified range. The new tire pres-
sures are then accepted as reference values
and monitored.
If you wish to cance lthe restart:
XPress %.
The tire pressure value sstoredatt he last
restart will continu etobemonitored.
Radio type approval for the tire pres-
sure monitor
CountryRadio type approval number
USAFCC ID: MRXMW2433A
FCCIC ID:MRXGG4 Thisd evice
complies with part 15 of the FCC
rules and with license exempt
RSS standard sofIndustry Can-
ada. Operation is subject to the
following conditions .(1) This
device may not cause harmful
interference, and (2) Thisd evice
mus taccept any interference
received, including interference
that may cause undesired oper-
ation. Le present appareile st
conforme d'industrieC anada
applicables au xappar eils radio
exempts de licence. L'exploita-
tion est authorisee au xdeuxc on-
ditions suivantes. (1) L'appareil
ne doi tpas produire de brouil-
lage, et (2) L'autisatue rdel'ap-
pareild oita ccepter toutb rouil-
lage radioelectriqu esubi, meme
si le brouillag eest susceptible
d'e ncompromettre le fonc-
tionnement. WARNING:C hanges
or modifications not expressly
approved by the party responsi-
bl ef or compliance could voidt he
user'sa uthority to operate the
equipment. The term "IC:" before the radio certification number
only signifies Canad atechnical
specifications were met.
FCC ID:MRXMC34MA4 This
device complies with part 15 of
the FCC rules and with license
exempt RSS standard sofIndus-
try Canada. Operation is subject
to the following conditions .(1)
Thisd evice may not cause harm-
ful interference, and (2) This
device mus taccept any interfer-
ence received, inclu
ding interfer-
ence that may cause undesired
operation. Le present appareil
est conforme d'industrieC anada
applicables au xappar eils radio
exempts de licence. L'exploita-
tion est authorisee au xdeuxc on-
ditions suivantes. (1) L'appareil
270Tire pressure
Wheel sand tires

CountryRadio type approval number
ne doit pas produire de brouil-
lage, et (2) L'autisatuer de l'ap-
pareil doit accepter tout brouil-
lage radioelectrique subi, meme
si le brouillage est susceptible
d'en compromettre le fonc-
tionnement. WARNING: Changes
or modifications not expressly
approved by thepartyr esponsi-
ble for compliance could void the
user'sa uthorityt ooperate the
equipment .The ter m"IC:"b efore
th er adio certification number
onl ysignifies Canada technical
specifications were met.
CanadaIC: 2546A-MW2433A
IC:2546A-GG4 This devic ecom-
plies with part 15 of th eFCC
rules and with licens eexempt
RSS standards of Industry Can-
ada. Operatio nissubject to the
following conditions. (1) This
devic emay not cause harmful
interference, and (2) This device
must accept any interference
received ,includingi nterference
that may cause undesiredo per-
ation. Le present appareil est
conforme d'industrie Canada
applicables aux appareils radio
exemptsdel icence. L'exploita-
tio ne st authorisee aux deux con-
ditionss uivantes.(1) L'appareil
ne doit pas produire de brouil-
lage, et (2) L'autisatuer de l'ap-
pareil doit accepter tout brouil-
lage radioelectrique subi, meme
si le brouillage est susceptible
d'en compromettre le fonc-
tionnement. WARNING: Changes
or modifications not expressly
approved by th epartyr esponsi-
ble for compliance could void the
user'sa uthorityt ooperate the
equipment .The ter m"IC:"b efore
th er adio certification number
onl ysignifies Canada technical
specifications were met.
IC: 2546A-MC34MA4
Loading th evehicle
Instruction labels for tires and loads
GWARNING
Overloadedt ires can overheat,c ausing a
blowout.O verloadedt ires can also impair the
steeringa nd driving characteristic sand lead
to brakef ailure. Thereisar isk of accident.
Observe th eload rating of th etires. The load
rating must be at least half of th eGAWR of
your vehicle .Never overload th etires by
exceedingt hemaximum load.
Two instruction labels on your vehicle show the maximum possible load.
(1) The Tire and LoadingI nformation placar dis
on th eB-pillar on th edriver' sside. The Tire
and LoadingI nformation placar dshows the
maximum permissible number of occu-
pant sand th emaximum permissible vehicle
load. It also contain sdetails of th etires izes
and corresponding pressures for tires
mounted at th efactory.
(2) The vehicle identification plateisont he
B-pillar on th edriver' sside. The vehicle
identification platei nformsyou of thegross
vehicle weight rating .Itismade up of the
vehicle weight,a ll vehicle occupants, the
fuel and th ecargo. You can also fin dinfor-
mation about th emaximum gross axle
weight rating on th efront and rear axle.
The maximum gross axle weight rating is
th em aximum weight that can be carried by
one axle (front or rear axle) .Never exceed
th em aximum load or th emaximum gross
axle weight rating for th efront or rear axle.
:B-pillar ,driver' sside
Loading th evehicle271
Wheels and tires
Z

Maximum permissible gross vehicle
weight rating
XSpecification for maximumgross vehicle
weight :is listed in the Tire and Loading
Informatio nplacard: "The combined weight of
occupants and cargo should never exceed
XXX kilograms or XXX lbs."
The gross weight of all vehicleo ccupants, load
and luggage must not exceed the specified
value.
iThe specifications shownont he Tire and
Loading Informatio nplacard in the illustration
are examples. The maximu mpermissible
gross vehiclew eight rating is vehicle-specific
and may differf rom that in the illustration.
You can find the vali dmaximu mpermissible
gross vehiclew eight rating for you rvehicleo n
the Tire and Loading Informatio nplacard.
Number of seats
Maximu mnumber of seats :indicates the
maximu mnumber of occupants allowedt o
travel in the vehicle. This information can be
found on the Tire and Loading Informatio nplac-
ard.
iThe specifications shownont he Tire and
Loading Informatio nplacard in the illustration
are examples. The number of seats is vehicle-
specific and can differf rom the details shown.
The number of seats in you rvehiclec an be
found on the Tire and Loading Information
placard.
Determiningt he correct load limit
Step-by-ste pinstructions
The following steps have been developed as
required of all manufacturers under Title 49,
Cod eofU .S. FederalR egulations, Part 575 pur-
suant to the "National Traffi cand Motor Vehicle
Safety Act of 1966".
XStep 1: Locate the statement "The combined
weight of occupants and cargo should never
exceed XXX kg or XXX lbs." on you rvehicle’s
Tire and Loading Informatio nplacard.
XStep 2: Determine the combined weight of
the drivera nd passengers that wil lberiding in
you rvehicle.
XStep 3: Subtract the combined weight of the
drivera nd passengers from XXX kilograms or
XXX lbs.
XStep 4: The resulting figure equals the avail-
abl eamount of cargo and luggage loadc apa-
city. For example, if the "XXX "amount equals
1400 lbs and there wil lbefive 150-lb pas-
sengers in you rvehicle, the amount of avail-
abl ecargo and luggage loadc apacity is
650 lbs (1400 -750 (5 x150) = 650 lbs).
XStep 5: Determine the combined weight of
luggage and cargo being loaded on the vehi-
cle. That weight may not safel yexceed the
available cargo and luggage loadc apacity cal-
culated in step 4.
Example:s teps1to3
The following table showse xamples on how to
calculate total and cargo loadc apacities with
varying seating configurations and number and
size of occupants. The following examples use a
loadl imitof1 500 lbs (680 kg). This is for illus-
tration purposes only. Make sure you are
using the actua lloadl imitf or you rvehicles tated
on you rvehicle's Tire and Loading Information
placard (
Ypage2 71).
272Loading the vehicle
Wheels and tires

The greater the combined weight of the occu-
pants, the lower the maximum luggage load.
Step 1
Example 1Example 2
Combined max-
imum weight of
occupants and
cargo (data
from the Tire
and Loading
Information
placard)1500 lbs
(680 kg)1500 lbs
(680 kg)
Step 2
Example 1Example 2
Number of peo-
ple in the vehi-
cle (driver and
occupants)12
Weight of the
occupantsOccu-
pant 1:
175 lbs
(80 kg)Occu-
pant 1:
175 lbs
(80 kg)
Occu-
pant 2:
195 lbs
(88 kg)
Gross weight
of all occupants175 lbs
(80 kg)370 lbs
(168 kg)
Step 3
Example 1Example 2
Permissible
load (maxi-
mum gross
vehicle weight
rating from the
Tire and Load-
ing Information
placardminus
the gross
weight of all
occupants)1500 lbs
(680 kg) Ò
175 lbs
(80 kg) =
1325 lbs
(600 kg)1500 lbs
(680 kg) Ò
370 lbs
(168 kg) =
1130 lbs
(512 kg)
Vehicle identification plate
Even if you have calculated the total cargo care-
fully, you should still make sure that the gross
vehicle weight rating and the gross axle weight
rating are not exceeded. Details can be found on
the vehicle identification plate on the B-pillar on
the driver's side of the vehicle (
Ypage 271).
Permissible gross vehicle weight: the gross
weight of the vehicle, all passengers and the
load must not exceed the permissible gross
vehicle weight.
Gross Axle Weight Rating (GAWR): the maxi-
mum permissible weight that can be carried by
one axle (front or rear axle).
To ensure that your vehicle does not exceed the
maximum permissible values (gross vehicle
weight and maximum gross axle weight rating),
have your loaded vehicle (including driver, occu-
pants and the load) weighed on asuitable vehi-
cle weighbridge.
All about wheels and tires
Uniform Tire Quality Grading Stand-
ards
Overview of Tire Quality Grading Stand-
ards
Uniform Tire Quality Grading Standards are U.S. government specifications. Their purpose is to
provide drivers with uniform reliable information
on tire performance data. Tire manufacturers
have to grade tires using three performance fac-
tors: :tread wear grade, ;traction grade and
= temperature grade. These regulations do not
apply to Canada. Nevertheless, all tires sold in
North Americaa re provided with the corre-
sponding quality grading markings on the side-
wall of the tire.
All about wheelsa nd tires273
Wheels and tires
Z