2019 MERCEDES-BENZ SLC ROADSTER tires

is
shown inthe Serv . Serv
.men uof the multif unc-
tion display. Ex
ample: currenttirepress uredisplay
For informat iononthe mess agedisplay, refer
to the "Check ingthe tirepress ureelect roni-
cally" section(Ypage 276).
Imp ortant safet ynotes G
WARN
ING
Eac htir e, inc luding thespare (ifprov ided),
should bechec kedatleast onceamon th
when coldandinflated tothe press urerec-
omme ndedbythe vehic lemanuf acturer on
the Tire andLoadin gInf ormat ionplacard on
the drive r'sdoor B-pillar orthe tirepress ure
label onthe inside ofthe fuel filler flap.If
your vehic lehas tires ofadiffe rentsize than
the size indic ated onthe Tire andLoadin g
Inf ormat ionplacard orthe tirepress ure
label, youshould determin ethe proper tire
press ureforthosetires.
As anadded safetyfeat ure, your vehic lehas
been equipped withatir epress uremon itor-
ing syst em(TPMS )that illuminat esalow tire
press uretelltalewhen oneormore ofyour
tir es are sign ifican tlyunder inflated. Accor d-
ingly, when thelow tirepress uretelltaleillu-
min ates, youshould stopand chec kyour
tir es assoon aspossible ,and inflate themto
the proper pressure.Drivin gon asign ifi-
can tlyunder inflated tirecauses thetireto
over heat andcanlead totirefailure. Under-
inf lation alsoreduc esfuel effic iencyand tire
tr ead life,and may affec tthe vehic le'shan-
dling andstopping ability.
Please notethat theTPMS isnot asubst i-
tut efor proper tiremaint enance,and itis
the drive r'srespo nsibilit yto maint aincor-
rec ttir epress ure,even ifunder inflation has not
reach edthe level totrigger illuminat ion
of the TPMS lowtirepress uretelltale.
Your vehic lehas also been equipped witha
TPMS malfun ction indic atortoindic ateifthe
syst emisnot operat ingproper ly.The TPMS
malfun ction indic atoriscom bined withthe
low tirepress uretelltale. When thesyst em
dete ctsa malfun ction, thewarnin glamp will
flash forapprox imatelyamin ute and then
remain continuously illuminat ed.This
sequen cewill berepeat edever ytim ethe
vehic leisstar ted aslong asthe malfun ction
exis ts.
When themalfun ction indic atorisillumina-
ted, thesyst emmay notbeable todete ctor
sign allow tirepress ureasintended .TPMS
malfun ctions may occurfor avariet yof rea-
son s,inc luding theinstallation ofinc ompat i-
ble replac ementor alter natetir es orwheels
on the vehic lethat preventtheTPMS from
func tioningproper ly.Always checkthe
TPMS malfun ction tellt aleafterreplac ing
one ormore tires orwheels onyour vehic le
to ens ure that thereplac ementor alter nate
tir es and wheels allowtheTPMS tocon tinue
to func tion proper ly.
It is the drive r'srespo nsibilitytoset the tire
press uretothat recomme ndedforcold tires
which issuitable forthe operat ingsituat ion
(Y page 270).Not ethat thecorrecttir epres-
sure forthe curr entoperat ingsituat ionmust
firs tbe taught -intothe tirepress uremon itor.
If asubst antialloss ofpress ureoccurs, the
warnin gthr eshold forthe warnin gmess ageis
aligned tothe taught -inrefe rencevalues.
Restar tthe tirepress uremon itorafteradjust -
ing the press ureofthe cold tires
(Y page 277). Thecurrentpress uresare
saved asnew referencevalues. Asaresult ,a
warnin gmess agewillappear ifthe tirepres-
sure drops significant ly.
The tirepress uremon itordoes notwarn youof
an incorre ctly set tirepress ure.Obser vethe
not eson the recomme ndedtirepress ure
(Y page 270).
The tirepress uremon itorisnot able towarn
you ofasudden lossofpress ure,e.g.ifthe
tir eis penet ratedby afor eign object.In the
even tof asudden lossofpress ure,bringthe Tir
epr essur e
275Wheels andtires Z

vehicl
eto ahal tby braking carefully.Avoid
abru ptsteering movements.
The tirepressu remonitor hasayel low warni ng
lamp inthe instrument clusterforindica ting
pressu reloss oramalfu nction. Whether the
warni nglamp flashes orlights upindica tes
whethe ra tire pressu reistoo low orthe tire
pressu remonitor ismalfu nctioning:
R ifthe warni nglamp islit continuous ly,the
tire pressu reon one ormore tiresissignifi -
cantly toolow.The tirepressu remonitor is
not malfu nctioning.
R ifthe warni nglamp flashes forapp rox-
imatel ya minute andthen remai nslitcon-
stantly, thetire pressu remonitor ismalfu nc-
tioning.
In add ition tothe warni nglamp ,a messa ge
app ears inthe multi function display.Observe
the informati onondisp laymessa ges
(Y pag e201) .
It may take uptoten minutes foramalfu nc-
tion ofthe tire pressu remonitor tobe indica -
ted. Amalfu nction willbe indica tedbythe tire
pressu rewarni nglamp flashing forapp rox-
imatel yone minute andthen remai ninglit.
When themalfu nction hasbeen rectified ,the
tire pressu rewarni nglamp goesoutafter a
few minutes ofdrivi ng.
The tirepressu revalu esindica tedbythe on-
boa rdcomputer maydiffer fromthose meas-
ured atagas station withapressu regage .The
tire pressu resshow nby the on-board com-
puter refertothose measu redatsea level .At
high altitudes, thetire pressu revalu esindica -
ted byapressu regage arehighe rthan those
show nby the on-board computer. Inthis case,
do not redu cethe tire pressu res.
The opera tionofthe tire pressu remonitor can
be affected byinterference fromradiotrans-
mitting equipme nt(e.g. radiohead phones,
two-wa yradi os)that may bebeing operatedin
or near thevehicl e.
Chec kingthetire pressure electroni -
call y X
Make surethattheSmartKey isin posi tion
0048 (Ypag e118) inthe ignitio nlock.
X Press the0059 or0065 button onthe steer-
ing whee lto sele ctthe Serv. Serv.
menu. X
Press the0063 or0064 button tosele ct
Tire Pressure Tire
Pressure .
X Press 0076.
The current tirepressu reofeach tireis
show nin the multi function display.
If the vehicl ehas been parked forover
20 minutes ,the Tire pressure willbe Tire
pressure willbe
displaye dafter driving afew minutes displaye
dafter driving afew minutes
messa geapp ears.
After ateach-in process, thetire pressu re
monitor automatical lydetects newwhee lsor
new sensors. Aslong asaclea rall ocation of
the tire pressu revalu eto the indivi dualwhee ls
is not possi ble,theTire Pressure Monitor Tire
Pressure Monitor
Active Active
displaymessa geisshow ninstead of
the tire pressu redisp lay.The tirepressu res
are already being monitored.
If an emerge ncyspare wheelis mounted, the
system maycontinue toshow thetire pressu re
of the whee lthat hasbeen removed forafew
minutes. Beawa rethat thevalu edisp layed for
the posi tion where theemerge ncyspare wheel
is fitted isnot thesame asthe current tire
pressu reofthe emerge ncyspare wheel.
Tire pressure monitorwarnin gmes-
sage s The
tirepressu remonitor detectsapressu re
loss inone ormore tires:
R Ifthe tire pressu remonitor detectsapres-
sure lossinone ormore tires,awarni ng
messa geisshow nin the multi function dis-
pla y.The yellow tirepressu rewarni nglamp
then lights up.
R Ifthe Please Correct TirePressure Please
Correct TirePressure
messa geapp ears inthe multi function dis-
pla y,the tire pressu reinat lea stone tireis
too low.The tirepressu remust becorrected
when theoppo rtunity arises.
R Ifthe Check Tires Check
Tiresmessageapp ears inthe
multi function display,the tire pressu reinat
lea stone tirehas dropp edsignifi cantly. The
tires must bechecked.
R Ifthe Warning TireMalfunct ion Warning
TireMalfunct ionmes-
sage appears inthe multi function display,
the tire pressu reinat lea stone tirehas
dropp edsudd enly.The tires must be
checked.
Observe theinstructions andsafety notesin
the disp laymessa gesinthe "Tires" section
(Y pag e201). 276
Tire
pressureWhee lsand tires

If
the wheel positio nson the vehicle arerota-
ted, thetire pressu resmay bedispl ayedfor
the wrong positionsfor ashort time.Thisis
rectified afterafew minutes ofdriving, andthe
tire pressu resare displ ayedfor the correct
positio ns.
Restarting thetire pressure monitor When
yourestart thetire pressu remonitor, all
existing warning message sare dele tedand the
warning lampsgo out. Themonitor usesthe
currently settire pressu resasthe reference
valu esfor monitoring. Inmost cases, thetire
pressu remonitor willautoma ticallydetect the
new reference valuesafter youhave changed
the tire pressu re.However, youcan also set
reference valuesmanua llyas describe dhere.
The tirepressu remonitor thenmonitors the
new tirepressu revalu es.
X Set thetire pressu reto the valu erecom-
mended forthe corresponding drivingsitua-
tion onthe Tire andLoadi ngInformation
pla card onthe driver's sideB-pilla r
(Y page 270).
Additional tirepressu revalu esfor different
load scan also befound onthe tire pressu re
table onthe inside ofthe fuel fillerflap
(Y page 270).
X Make surethatthetire pressu reiscorrect
on allfour wheel s.
X Ensure thattheSmartKey isin positio n0048
in the ignition lock.
X Press the0059 or0065 button onthe steer-
ing wheel toselect theServ. Serv.
menu.
X Press the0063 or0064 button toselect
Tire Pressure Tire
Pressure.
X Press 0076.
The multifu nctiondisplayshows thecurrent
tire pressu refor the individ ualtires orthe
Tire pressure willbedisplayed Tire
pressure willbedisplayed
after driving afew minutes after
driving afew minutes message.
X Press the0064 button.
The Use Current Pressures asNew Use
Current Pressures asNew
Reference Values Reference
Valuesmessage appearsinthe
multifu nctiondisplay.
If you wishto con firm therestart:
X Press 0076.
The Tire Press. Monitor Restarted Tire
Press. Monitor Restarted
messag eappe arsinthe multifu nctiondis-
pla y. After
driving forafew minutes, thesystem
checks whether thecurrent tirepressu res
are within thespecifie drange. Thenew tire
pressu resare then accepted asreference
valu esand monitored.
If you wishto canc elthe restart:
X Press 0038.
The tirepressu revalu esstored atthe last
restart willcontinue tobe monitored. Tire
pressure
277Wheelsand tires Z

Radio
typeapprov alfor the tire pres -
sure monitor Co
untry Radio
typeapprov alnumb er USA FCC
ID:MRXMW 2433A
FCC ICID:MR XGG4 Thisdev ice
comp lies with part15 ofthe
FCC rules and with license
exem ptRSS stand ardsof Indu s-
try Canad a.Ope rationissu bject
to the followi ng condi tions.(1)
Thi sdev icemay notcause
ha rmfu linter ference, and(2)
Thi sdev icemus tacce ptany
inter ference rece ived,incl uding
inter ference that may cause
und esired operation. Lepre sent
ap pa rei lest confor med'indu s-
trie Canad aap plica bles aux
ap pa rei lsrad ioexem ptsde
li cence. L'exploitati onest
au thori seeauxdeu xcondi tions
su iva ntes. (1)L'appare ilne doit
pa spro duire debro uillag e, et
(2) L'autisatue rde l'app are il
doi tacce ptertoutbro uillag e
rad ioelectri quesu bi,meme sile
bro uillag eest suscep tibled'e n
comp romettrelefoncti onne-
ment. WARNING :Ch ang esor
mod ificati ons notexpr essly
ap pro ved bythe party respons i-
bl e for comp liance couldvoi d
the user' sau thori tyto ope rate
the equipment. Theterm "IC:"
bef ore theradiocerti fication
numb eronly signifi esCanad a
techni calspe cificati ons were
met.
FCC ID:MR XMC34MA4 This
dev icecomp lies with part15 of
the FCC rules and with license
exem ptRSS stand ardsof Indu s-
try Canad a.Ope rationissu bject
to the followi ng condi tions.(1)
Thi sdev icemay notcause
ha rmfu linter ference, and(2)
Thi sdev icemus tacce ptany
inter ference rece ived,incl uding
inter ference that may cause
und esired operation. Lepre sent
ap pa rei lest confor med'indu s-
trie Canad aap plica bles aux
ap pa rei lsrad ioexem ptsde Co
untry Radio
typeapprov alnumb er li
cence. L'exploitati onest
au thori seeauxdeu xcondi tions
su iva ntes. (1)L'appare ilne doit
pa spro duire debro uillag e, et
(2) L'autisatue rde l'app are il
doi tacce ptertoutbro uillag e
rad ioelectri quesu bi,meme sile
bro uillag eest suscep tibled'e n
comp romettrelefoncti onne-
ment. WARNING :Ch ang esor
mod ificati ons notexpr essly
ap pro ved bythe party respons i-
bl e for comp liance couldvoi d
the user' sau thori tyto ope rate
the equipment. Theterm "IC:"
bef ore theradiocerti fication
numb eronly signifi esCanad a
techni calspe cificati ons were
met. Ca
nad a IC:
2546A-MW 2433A
IC:2 546A-G G4Thisdev icecom-
pl ieswi th part15 ofthe FCC
rul es and with license exempt
RSS stand ardsof Indu stry Can-
ad a.Ope rationissu bject tothe
fol lowi ng condi tions.(1) This
dev icemay notcauseharmfu l
inter ference, and(2)Thisdev ice
mus tacce ptany inter ference
rece ived,incl uding inter ference
that may causeund esired oper-
ati on. Lepre sent apparei lest
confor med'indu strieCa nad a
ap plica bles auxap parei lsrad io
exem ptsdelicence. L'exploita-
tion estauthori seeauxdeu x
condi tions suiva ntes. (1)L'ap-
pa rei lne doitpa spro duire de
bro uillag e, et (2) L'autisatue rde
l'a pp are ildoi tacce ptertout
bro uillag erad ioelectri quesu bi,
meme sile bro uillag eest sus-
cep tibled'e ncomp romettrele
foncti onnem ent.WAR NING :
Ch ang esormod ificati ons not
expr esslyap pro ved bythe party
res pons ible for comp liance
cou ldvoi dthe user' sau thori ty
to ope rate theequipment. The
term "IC:"bef ore theradiocer-
tifi cati onnumb eronly signifi es
Ca nad atechni calspe cificati ons
we remet. 27
8 Tire
press ureWheelsand tires

Count
ry Ra
dio type approval number IC:
2546A-MC34 MA4 Load
ingthevehicle Inst
ruction labels fortires and loads G
WAR
NING
Ove rloade dtir es can over heat ,causi nga
blowout .Ove rloade dtir es can also impair
th est eerin gand drivingchar acteris ticsand
lead tobrak efailur e.Ther eis arisk ofacc i-
den t.
Obse rvetheload rating ofthetir es. The load
rat ing must beatleast halfoftheGAWR of
your vehicle.Nev erover load thetir es by
exc eedin gth emax imum load.
Two instruct ion labels onyour vehicle show
th emax imum possibleload.
(1) TheTire andLoadin gIn for mat ionplacar d
is on theB- pillar onthedriv er'sside. The
Tire andLoadin gIn for mat ionplacar d
shows themax imum permissiblenum ber
of occ upant sand themax imum permissi-
ble vehicle load. Italso contain sdet ails of
th etir esiz es and correspon ding pressures
for tires moun tedatthefac tory.
(2) Thevehicle iden tificat ion plat eis on the
B- pillar onthedriv er'sside. Thevehicle
iden tificat ion plat einf orm syou ofthe
gro ssveh icle weight rating .It is made up
of theveh icle weight ,all veh icle occu-
pant s,thefuel andthecar go. You canalso
fin dinf orm ationabout themax imum gross
axle weight rating onthefro ntand rear
axle.
The maximum grossaxle weight rating is
th emax imum weight that can becar ried
by one axle (front orrear axle) .Nev er
exc eed themax imum loadorthemax i-
mum grossaxle weight rating forthefro nt
or rear axle. 0043
B-pillar ,driv er'sside Ma
xim um permis sible grossvehicle
weight ratin g X
Spe cificat ion formax imum grossveh icle
weight 0043islist ed intheTire andLoadin g
In for mat ionplacar d:"The combinedweight
of occ upant sand cargoshould never
exc eed XXX kilogram sor XXX lbs."
The grossweight ofall veh icle occupant s,load
and luggage mustnotexceed thespec ified
value.
i The
spec ificatio nsshown ontheTire and
Loadin gIn for mat ionplacar din theillust ra-
tio nare exam ples.Themaximum permissi-
ble grossveh icle weight rating isveh icle-
spec ificand may differfro mthat intheillus-
tr atio n.You canfindth evalid maximum per-
miss iblegrossveh icle weight rating foryour
veh icle ontheTire andLoadin gIn for mat ion
placar d. Load
ingthevehicle
279Wheels andtires Z

Numbe
rof seats Ma
xim um num berof seats 0043indicates the
ma xim um num berof occu pants allo we dto
tra vel inthe vehicle. Thisinf orm ation can be
fou ndonthe Tire and Loading Info rma tion
pl aca rd.
i Th
esp eci ficat ions sho wnonthe Tire and
Loa ding Info rma tionplaca rdinthe illu stra -
tio nar eexa mpl es.Th enum berof seats is
veh icle-s pecificand candiffe rfro mthe
de tai lssho wn. Thenum berof seats inyour
veh iclecan befou ndonthe Tire and Load-
ing Info rma tionplaca rd. De
termi ning the correc tlo ad limit
Ste p-by -stepin struc tions Th
efol lowi ng ste pshave been devel oped as
req uired ofallma nuf acturers und erTitle 49,
Co de ofU.S. FederalRe gulatio ns, Part575
pu rsu ant tothe "Nati ona lTra fficand Motor
Ve hicle Safety Act of1966 ".
X Ste p1: Loc ate the stateme nt"The com -
bi ned weight ofoccu pants and cargosho uld
neve rexce edXXX kgorXXX lbs." onyour
veh icle’sTire and Loading Info rma tionplac-
ar d.
X Ste p2: Dete rminethe com bined weight of
the driver and passe nge rstha twi llbe ridi ng
in your veh icle.
X Ste p3: Sub tractthe com bined weight of
the driver and passe nge rsfro mXXX kilo-
gra ms orXXX lbs.
X Ste p4: Theres ulting figu re equalsthe avail-
ab leam ount ofcar goand lugg ageload
cap acity. For exampl e,ifthe "XXX" amount
eq uals1400 lbsand therewillbe five 150-l b
pa sse nge rsinyour veh icle, the amount of av
ailabl e car goand lugg ageload cap acityis
650 lbs(14 00-750 (5x150) =650 lbs).
X Ste p5: Dete rminethe com bined weight of
lu gg ageand cargobeing load ed on the vehi-
cle .Th at we ight ma ynot safel yexce edthe
av ailabl e car goand lugg ageload cap acity
cal culated inste p4. Ex
ampl e:ste ps1to 3
Th efol lowi ng tab lesho wsexa mpl eson howto
cal culate tota land cargoload cap acitieswi th
va rying seati ng conf igur ati ons and num berand
si ze ofoccu pants. Thefol lowi ng exa mpl esuse
a load limi tof 1500 lbs(68 0kg ).Thi sis for
il lus trati onpurpo seson ly.Ma kesure you
ar eus ing the actu alload limi tfor your veh icle
sta ted onyour veh icle'sTire and Loading Info r-
ma tionplaca rd(Y page 279 ).
Th egre aterthe com bined weight ofthe occu -
pa nts, thelowe rthe maxim um lugg ageload .
Ste p1 Ex
ampl e1 Ex
ampl e2 Co
mbi nedmax-
imu mwe ight
of occu pant s
and cargo
(da tafro mthe
Tire andLoad-
in gIn fo rma-
tio npla card) 1500
lbs
(68 0kg ) 1500
lbs
(68 0kg ) 28
0 Lo
adi ng the vehicleWhe elsand tires

Step
2 Example
1 Example
2 Num
berofpeo-
ple inthe vehi-
cle (driver and
occupants) 1 2
Weight
ofthe
occupants Occu-
pant 1:
175 lbs
(80 kg) Occu-
pant 1:
175 lbs
(80 kg)
Occu-
pant 2:
195 lbs
(88 kg) Gross
weight
of all occu-
pants 175
lbs
(80 kg) 370
lbs
(168 kg) Step
3 Example
1 Example
2 Permissible
load (maxi-
mum gross
vehicle weight
rat ing from
the Tire and
Loading Infor-
mat ionplac-
ard minus the
gross weight
of all occu-
pants) 1500
lbs
(680 kg)00F8
175 lbs
(80 kg)=
1325 lbs
(600 kg) 1500
lbs
(680 kg)00F8
370 lbs
(168 kg)=
1130 lbs
(512 kg) Vehicle
identification plate
Even ifyou have calculated thetotal cargo
carefully, youshould stillmake surethatthe
gross vehicle weightratingandthegross axle
weight ratingarenot exceeded. Detailscanbe
found onthe vehicle identification plateonthe
B-pillar onthe driver's sideofthe vehicle
(Y page 279).
Permissible grossvehicle weight: thegross
weight ofthe vehicle, allpassengers andthe
load must notexceed thepermissible gross
vehicle weight. Gross
AxleWeight Rating (GAWR): themaxi-
mum permissible weightthatcanbecarried by
one axle (front orrear axle).
To ensure thatyour vehicle doesnotexceed
the maximum permissible values(grossvehi-
cle weight andmaximum grossaxleweight rat-
ing), have yourloaded vehicle (including driver,
occupants andtheload) weighed onasuitable
vehicle weighbridge. All
about wheelsand tires Uniform
TireQuality GradingStand -
ard s
Overview ofTire Quality Grading
Stand ards Uniform
TireQuality Grading Standards are
U.S. governmen tspecifications. Theirpurpose
is to provide driverswithuniform reliableinfor-
mation ontire performance data.Tiremanu-
facturers havetograde tiresusing threeper-
formance factors:0043tread weargrade, 0044
tract iongrade and0087temperature grade.
These regulations donot apply toCanada.
Nevertheless, alltires soldinNorth America
are provided withthecorrespondin gqual ity
grading markings onthe sidewal lof the tire.
Quality gradescanbefound, whereapplicab le,
on the tire sidewal lbetween treadshoulder
and maximum sectionwidth.
Example:
R Tread weargrade: 200
R Tra ction grade: AA
R Temper aturegrade: A
All passenger cartires must confor mto the
statutory safetyrequirements inaddition to
these grades. All
about wheelsand tires
281Wheels andtires Z

i
The
actual values fortires arevehicle-spe-
cific andmay deviate fromthevalues inthe
illustration.
Tr eadwear The
treadwear gradeisacomparative rating
based onthe wear rateofthe tire when tested
under controlled conditionsonaspecified U.S.
governm entcourse. Forexample, atire graded
150 would wearoneandone-half timesaswell
on the governm enttest track asatire graded
100.
The relative performan ceoftires depends
upon theactual conditionsoftheir use,how-
ever, andmay depart significant lyfrom the
norm duetovariations indriving habits, ser-
vice practic esand differenc esinroad charac-
terist icsand climate.
Tr action G
WARNIN
G
The tract iongrade assigned tothis tireis
based onstraight -aheadbraking traction
test s,and does notinclude acceleration ,
corn ering, hydroplaning, orpeak traction
charact eristics.
! Avoid
wheelspin. Thiscanlead todamage
to the drive train.
The tract iongrades –from highest tolowest –
are AA, A,Band C.Those grades represent the
tire's ability tostop onwet pavement asmeas-
ured under controlled conditionsonspecified
governm enttest surfaces ofasphalt andcon-
cret e.Atire marked Cmay have poortraction
performan ce.
The safe speed onawet, snow covered oricy
road isalway slower thanondry road surfa-
ces.
You should payspecial attentiontoroad con-
ditions whentemperat uresarearound freezing
point.
Mercedes- Benzrecomm endsaminimum tread
depth of00CF in(4 mm) onallfour winter tires.
Observe thelegally required minimum tire
tread depth (Ypage 268). Winter tirescan
reduce thebraking distance onsnow-c overed
surfaces incomparison withsummer tires.The
braking distance isstill much further thanon surfaces
thatarenot icyorcovered withsnow.
Take appropriate carewhen driving.
Temp erature G
WARNIN
G
The temperat uregrade forthis tireisestab-
lished foratire that isproperly inflatedand
not overloaded. Excessive speed, underinfla-
tion, orexcessiv eloading, eitherseparately
or incombinat ion,cancause excessiv eheat
build-up andpossible tirefailure.
The temperat uregrades areA(the highest), B,
and C,represent ingthe tire's resistanc eto the
generation ofheat anditsability todissipate
heat when testedunder controlled conditions
on aspecified indoorlaboratory testwheel.
Sustained hightemperat urecan cause the
material ofthe tire todegenerate andreduce
tire life, and excessiv etemperat urecan lead to
sudden tirefailure. Thegrade Ccorrespon ds
to alevel ofperforman cewhich allpassenger
car tires must meet under theFederal Motor
Vehicle SafetyStandard No.109. Grades B
and Arepresent higherlevelsofperforman ce
on the laboratory testwheel thantheminimum
required bylaw. 282
All
about wheelsand tiresWheels andtires