tires MERCEDES-BENZ GLA 2020 Service Manual

The
tirepressure monitordoes notwarn youof
an incorr ectlysettire pressure. Observethe
not eson the recomm endedtirepressure
(Y page 308).
The tirepressure monitorisnot able towarn
you ofasudden lossofpressure, e.g.ifthe
tire ispenetr atedbyaforeign object.In the
event ofasudden lossofpressure, bringthe
vehicle toahalt bybraking carefully. Avoid
abrupt steeringmovemen ts.
The tirepressure monitorhas ayellow warning
lamp inthe instr ument cluster forindicatin g
pressure lossoramalfunct ion.Whether the
warning lampflashes orlights upindicates
whether atire pressure istoo low orthe tire
pressure monitorismalfunct ioning:
R ifthe warning lampislit cont inuously, the
tire pressure onone ormore tiresissignifi-
cant lytoo low. Thetirepressure monitoris
not malfunct ioning.
R ifthe warning lampflashes foraround a
minute andthen remains litconst antly, the
tire pressure monitorismalfunct ioning.
In addition tothe warning lamp,amessage
appears inthe multifunct iondisplay .Observe
the inform ationondisplay messages
(Y page 224).
It may take uptoten minutes foramalfunc-
tion ofthe tire pressure monitortobe indica-
ted. Amalfunct ionwill beindicated bythe tire
pressure warninglampflashing forapprox-
imately oneminute andthen remaining lit.
When themalfunct ionhas been rectified, the
tire pressure warninglampgoesoutafter a
few minutes ofdriving.
The tirepressure valuesindicated bythe on-
board computer maydiffer fromthose meas-
ured atagas station withapressure gauge.
The tirepressures shownbythe on-board
computer refertothose measured atsea level.
At high altitudes, thetire pressure valuesindi-
cated byapressure gaugearehigher than
those shown bythe on-board computer. Inthis
case, donot reduce thetire pressures.
The operation ofthe tire pressure monitorcan
be affect edbyinter ferenc efrom radio trans-
mitt ingequipment (e.g.radio headphones,
two-way radios)thatmay bebeing operated in
or near thevehicle. Checking
thetire pressur eelectroni-
cally X
Make surethattheSmart Keyisin position
0048 inthe ignition lock(Ypage 125).
X Press 0059or0065 onthe steerin gwheel
to select theServ. Serv.
menu.
X Press the0063 or0064 button toselect
Tire Pressure Tire
Pressure.
X Press the0076 button .
The current tirepressure ofeach tireis
shown inthe multifunct iondisplay .
If the vehicle wasparked forlonger than
20 minutes, theTire pressure willbe Tire
pressure willbe
displayed afterdriving afew minutes displayed
afterdriving afew minutes
message isshown.
Aft erateach- inprocess, thetire pressure
monit orautomatically detectsnew wheels or
new sensors. Aslong asaclear allocation of
the tire pressure valuetothe individual wheels
is not possible, theTire Pressure Monitor Tire
Pressure Monitor
Active Active
message isshown instead ofthe tire
pressure display.The tirepressures are
already beingmonitored.
If an emergenc yspare wheel ismounted, the
system maycontinue toshow thetire pressure
of the wheel thathasbeen removed forafew
minutes. Ifthis occurs, notethat thevalue dis-
played forthe position wherethespare wheel
is fitt ed isnot thesame asthe current tire
pressure ofthe emergenc yspare wheel.
Tire pressur emonitor warning mes-
sages If
the tire pressure monitordetect sa pressure
loss inone ormore tires,awarning message is
shown inthe multifunct iondisplay .The yellow
tire pressure warninglampthenlights up.
R Ifthe Please Correct TirePressure Please
Correct TirePressure
message appearsinthe multifunct iondis-
play, thetire pressure inat least onetireis
too low. Thetirepressure mustbecorrec ted
when theopportunit yarises.
R Ifthe Check TirePressure Check
TirePressure message
appears inthe multifunct iondisplay ,the tire
pressure inone ormore tireshasdropped
significant ly.The tires must becheck ed.
R Ifthe Tire Pressure WarningTire Tire
Pressure WarningTire
Failure Failure
message appears,thetire pressure
in one ormore tireshasdropped suddenly.
The tires must becheck ed. 314
Tir
epr essureWheels andtires

Observe
theinstruct ionsandsafety notesin
the displa ymessages inthe "Tires" section
(Y page 224).
If the wheel positions onthe vehicle arerota-
ted, thetire pressures maybedispla yedfor
the wrong positions forashort time.Thisis
rectified afterafew minutes ofdriving, andthe
tire pressures aredispla yedforthe correct
positions.
Restart ingthe tire pressure monitor When
yourestart thetire pressure monitor,all
existing warning messages aredeleted andthe
warning lampsgoout. Themonitor usesthe
currently settire pressures asthe reference
value sfor monitoring. Inmost cases, thetire
pressure monitorwillautomaticall ydetect the
new reference valuesafter youhave changed
the tire pressure. However, youcan also set
reference valuesmanuall yas described here.
The tirepressure monitorthenmonitors the
new tirepressure values.
X Set thetire pressure tothe value recom-
mended forthe corresponding drivingsitua-
tion onthe Tire andLoading Information
placard onthe driver's side
B-pillar (Ypage 308).
You canfind more tirepressure valuesfor
various operating conditions inthe tire pres-
sure table inside thefuel filler flap
(Y page 144).
X Make surethatthetire pressure iscorrect
on allfour wheels.
X Make surethattheSmartKey isin position
0048 inthe ignition lock(Ypage 125).
X Press 0059or0065 onthe steering wheel
to select theServ. Serv.
menu.
X Press the0063 or0064 button toselect
Tire Pressure Tire
Pressure.
X Press the0076 button.
The multifunction displayshows thecurrent
tire pressure foreach tireorthe Tire Tire
pressure willbedisplayed after pressure
willbedisplayed after
driving afew minutes driving
afew minutes message.
X Press the0064 button.
The multifunction displayshows theUse Use
Current Pressures asNew Reference Current
Pressures asNew Reference
Values Values
message. If
you wish toconfirm therestart :
X Press the0076 button.
The Tire Press. Monitor Restarted Tire
Press. Monitor Restarted
message appearsinthe multifunction dis-
play .
After driving forafew minutes, thesystem
checks whether thecurrent tirepressures
are within thespecified range.Thenew tire
pressures arethen accepted asreference
value sand monitored.
If you wish tocance lthe restart :
X Press the0038 button.
The tirepressure valuesstored atthe last
restart willcont inue tobe monitored. Tire
pressur e
315Wheels andtires 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'a ppare ilne doit
pa spro duire debro uillag e, et
(2) L'autisateu 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 essively
ap pro ved bythe party respons i-
bl e for comp liance couldvoi d
the users authori 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
cense .L'e xploitati onest
au thori seeauxdeu xcondi tions
su iva ntes. (1).L'a ppare 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 essively
ap pro ved bythe party respons i-
bl e for comp liance couldvoi d
the users authori 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 ptsdelicense .L'e xploita-
tion estauthori seeauxdeu x
condi tions suiva ntes. (1).L'a p-
pa rei lne doitpa spro duire de
bro uillag e, et (2) L'autisateu 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 essivelyap pro ved bythe
pa rty respons ible for comp li-
ance couldvoi dthe users
au thori tyto ope rate theequip-
ment. Theterm "IC:"bef ore the
rad iocerti fication numb eronly
sig nifi esCanad atechni calspe c-
ifi cati ons weremet. 31
6 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 theB-
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
317Wheels 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 size ofoccu pants. Thefol lowi ng exa mpl esusea
lo ad limi tof 1500 lbs(68 0kg ).Thi sis forillus trati onpurpo seson ly.Ma kesure youar eus ing
the actuallo ad limi tfor your veh iclesta ted onyour veh icle'sTire and Loading Info rma tionplac-
ar d(Y page 317 ).
Th egre aterthe com bined weight ofthe occu pants, thelowe rthe maxim um lugg ageload .
Ste p1 Ex
ampl e1 Ex
ampl e2 Ex
ampl e3 Co
mbi nedmaxi mum
we ight ofoccu pan ts
and cargo (datafro m
the Tire andLoadi ng
In fo rmati onplacard) 1500
lbs(68 0kg ) 1500
lbs(68 0kg ) 1500
lbs(68 0kg ) 31
8 Lo
adi ng the vehicleWhe elsand tires

Step
2 Example
1 Example
2 Example
3 Num
berofpeople in
the vehicle (driverand
occupants) 5 3 1
Distribution
ofthe
occupants Front
:2
Rear: 3 Front
:1
Rear: 2 Front
:1 Weight
ofthe occu-
pants 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 ofall
occupants 750
lbs(340 kg) 540
lbs(245 kg) 150
lbs(68 kg) Step
3 Example
1 Example
2 Example
3 Permissible
load(max-
imum grossvehicle
weight rating from the
Tire andLoading Infor-
mat ionplacard minus
the gross weight ofall
occupants) 1500
lbs(680 kg)00F8
750 lbs(340 kg)=
750 lbs(340 kg) 1500
lbs(680 kg)00F8
540 lbs(245 kg)
=960 lbs(435 kg) 1500
lbs(680 kg)00F8
150 lbs(68 kg)=
1350 lbs(612 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 317).
Permissible GrossVehicle WeightRating
(GVWR): thegross weight ofthe vehicle, all
passengers, loadandtrailer load/noseweight
(if applicab le)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, cargo,andfulltrailer loadifappli-
cable) weighed onasuitable vehicleweigh-
bridge. Loading
thevehicl e
319Wheels andtires Z

All
abou twheels andtires Unif
orm Tire Qua lityGr ad ing Stand -
ar ds
Over view ofTire Qua lityGr ad ing
St and ards Un
iform TireQuali tyGradi ngStand ards are
U. S. gov ernmen tspec ifications.The irpurp ose
is to pro videdri ver swit huni formrel iable infor-
mat ionontire per forman cedat a.Tir eman u-
fac turers haveto grad etires usin gth ree per-
for man cefac tors: 0043 tread wear grade,0044
tr act ion grad eand 0087tempe rature grad e.
The sereg ulat ionsdo notapply toCanad a.
Nev erthele ss,alltires sold inNor thAm erica
are provided withth eco rrespo nding qualit y
grad ingmar king son theside wall ofthetire.
Quali tygrad escan befoun d,wher eapplic able,
on thetire side wall between tread shoulder
and maximum section widt h.
Ex ampl e:
R Tread wear grad e:20 0
R Tract ion grad e:AA
R Tem peratur egr ad e:A
All pass enger cartires mus tco nform tothe
st atut orysafetyreq uire men tsinaddit ionto
th ese grad es.
i The
actual value sfor tires are vehicle-spe-
cif icand may deviatefrom thevalue sin the
illust ration .
Tr ead wear The
treadwe argrad eis aco mpar ative rating
base don thewear rateof thetire when tested
und ercontrol led cond ition son aspec ifiedU. S.
gov ernmen tco urs e.Fo rex ampl e,atire grad ed
15 0would wearoneand one-half times aswell on
thegov ernmen tco urs eas atire grad ed
10 0.
The relative per forman ceoftires depe nds
upon theact ual cond ition sof their use, how-
eve r,and may depar tsign ificant lyfrom the
no rm due tovar iation sin dri vin ghabit s,ser -
vic eprac tice sand differ encesin road charac -
te ris tics and climat e.
Tr act ion G
WAR
NING
The tract ion grad eassi gned tothis tire is
base don straig ht-ah ead brak ingtract ion
te sts, and does notinc lude acceler ation,
co rneri ng,hydr oplan ing,or peak tract ion
ch arac teris tics .
! Av
oid whee lspin.This canlead todamag e
to thedri ve train .
The tract ion grad es–from high esttolowes t–
are AA,A, Band C.Tho segrad esrep resentth e
ti re' sabilit yto stop onwet pave mentas meas -
ured undercontrol led cond ition son spec ified
gov ernmen tte st sur facesofasph altand con-
cr et e. Atire mar kedC may havepoor tract ion
per forman ce.
The safespee don awet ,sn ow cover edoricy
road isalways lowerthan on dry road surfa-
ce s.
You should pay spec ialattention toroad con-
dit ion swhen tempe ratures arearou ndfreez ing
poin t.
Mer cedes- Benz rec omm ends amin imum tread
dept hof 00CF in(4 mm) onallfour wintertires .
Obs erveth elegal lyreq uire dmin imum tire
tr ead dept h(Y page 306). Win tertires can
red uce thebrak ingdist anceon snow- cover ed
sur facesincompar isonwithsum mer tires .The
brak ingdist anceis still muc hfur ther than on
sur facesthat are noticy orcover edwithsn ow.
Tak eappr opriatecar ewhen drivin g.
Fur ther inform ation onwin tertires (M+ Stires )
(Y page 307).
Tem peratur e G
WAR
NING
The tempe rature grad efor this tire isest ab-
lish edfor atire that ispro perlyinf lat ed and
no tove rloaded. Exce ssi ve spee d,und erinfla- 320
All
abou twheels andtire sWh eels andtire s

tio
n,or exce ssive load ing ,ei the rse pa ratel y
or incomb ination,can causeexce ssive heat
bu ild-u pand possi ble tire failur e.
The temp eraturegra desar eA (th ehighe st),B,
and C,rep resenti ngthe tire'sres istance tothe
ge nera tionof heat and itsability todissi pate
he at wh en tested undercontro lled cond itions
on asp eci fiedind oorla bo ratory testwh eel.
Sus tained high temp eraturecan causethe
ma teri alof the tire todegenera teand reduce
tire life, and exce ssive temp eraturecan lead to
su dd en tire failur e. The gradeCcorr espo nds
to alevel ofperfo rma nce which allpa sse nge r
car tiresmu stmee tund erthe FederalMoto r
Veh icleSaf ety Stand ardNo. 109. Grad es B
and Arep resent highe rle vel sof perfo rma nce
on the labo ratory testwh eeltha nthe minim um
req uired bylaw. Tire
labelin g
Ov erv iew 0043
UniformTire Qu ality Grad ing Stand ards
(Y page 324 )
0044 Dep artment ofTra nsp orta tion,Tire Ide ntif i-
cati onNumbe r(Y page 323)
0087 Maxim um load rating (Ypage 323 )
0085 Maxim um tire pressu res (Ypage 311 )
0083 Manuf actu rer
0084 Tire ma teri al(Y page 324 )
006B Tire size designa tion,load -be aring capacity
and spee dra ting (Ypage 321 ) 006C
Loadind ex(Y page 323 )
006D Tire nam e
Th ema rkings descri bedab ove areon the tire
in ad ditio nto the tire nam e(sales designa tion)
and themanuf actu rer'snam e.
i Ti
re data isveh icle-s pecificand mayde vi-
ate fromthe data inthe exampl e.
Tire size des ignati on,lo ad-b earin g
ca pac ityand speedratin g G
WA
RNING
Excee ding the stated tire load -be aring capa-
city and theappro ved maxim um spee d
cou ldlead totire dama georthe tire burst-
ing .Th ere isaris kof acc ident.
Th ere fore,onl yus etire typesand sizes
ap pro ved foryour veh iclemod el.Ob serve
the tire load rating andspee dra ting
req uired foryour veh icle. 0043
Tire width
0044 Nom inalas pe ct ratio in%
0087 Tire cod e
0085 Rim diam ete r
0083 Loadbe aring index
0084 Spe edrating
Ge neral: dependi ng on the manuf actu rer's
sta nda rds,the size impri nted inthe tire wall
ma ynot conta inany letters orma yconta in
one letter thatpre ced esthe size descri ption.
If the reisno letter preced ingthe size descri p-
tio n(a ssho wnabove ):the searepa sse nge r
veh icletire sacc ording toEur opeanma nuf ac-
tur ing standa rds.
If "P "pre ced esthe size descri ption: theseare
pa sse nge rveh icletire sacc ording toU.S. man-
uf actu ringsta nda rds. Al
labo utwhee lsan dtire s
321Whe elsand tires Z

If
"LT" precedes thesize descriptio n:these are
light truck tiresaccording toU.S. manufactur-
ing standards.
If "T" precedes thesize descriptio n:compact
emergency wheelswith high tirepressu rethat
are only desig nedfortemporary useinan
emergency.
Tire width: tirewidth0043 shows thenominal
tire widthinmill imeters.
Aspec tratio: aspectratio 0044isthe size ratio
betwee nthe tire height andtirewidthand is
shown inpercent. Theaspe ctratio iscalcul a-
ted bydivid ingthe tire widthby the tire height.
Tire code :tire code 0087specifie sthe tire type.
"R" represents radialtires; "D"represents
dia gonal tires;"B"represents diagonal radial
tires.
Optional ly,tires withamaximum speedofover
149 mph (240 km/h )may have "ZR"in the
size descriptio n,dependi ngon the manufac-
turer (e.g.245/40 ZR18) .
Rim diameter: rimdiameter 0085isthe diame-
ter ofthe bead seat,notthediameter ofthe
rim flange. Therimdiameter isspecifie din
inches (in).
Load-be aringindex: load-bearing index0083is
a numerical codethatspecifie sthe maximum
load -bearing capacityof atire.
Do not overloa dthe tires byexceeding the
specifie dload limit.The maximum permissible
load canbefound onthe vehicle 'sTire and
Loadi ngInformation placard onthe B-pilla ron
the driver's side(Ypage 317).
Example:
Load-be aringindex 91indicates amaximum
load of1,356 lb(615 kg)that thetires can
bear. Forfurther information onthe maximum
tire load inkilogra msand lbs,see
(Y page 323).
For further information onthe load beari ng
index, see"Loa dindex" (Ypage 323).
Speed rating: speedrating0084specifie sthe
appro vedmaximum speedofthe tire.
i Tire
data isvehicle -specific andmay devi-
ate from thedata inthe example .
Rega rdless ofthe speed rating, always observe
the speed limits.Drive careful lyand adapt
you rdriving styletothe traffic conditions. Summer
tires Index Speed
rating Q up
to100 mph (160 km/h) R up
to106 mph (170 km/h) S up
to112 mph (180 km/h) T up
to118 mph (190 km/h) H up
to130 mph (210 km/h) V up
to149 mph (240 km/h) W up
to168 mph (270 km/h) Y up
to186 mph (300 km/h) ZR...Y up
to186 mph (300 km/h) ZR...(..Y) over
186mph (300 km/h ) ZR over
149mph (240 km/h ) R
Optional ly,tires withamaximum speedof
over 149mph (240 km/h) mayhave "ZR"in
the size descriptio n,dependi ngon the man-
ufacturer (e.g.245/40 ZR18).
The service specifica tionismade upofload -
beari ngindex 0083and speed rating0084.
R Ifthe size descriptio nof you rtire include s
"ZR "and there arenoservice specifica tions,
ask thetire manufacture rin order tofind
out themaximum speed.
If aservice specifica tionisavai lable,the
maximum speedislimi ted according tothe
speed ratinginthe service specifica tion.
Example: 245/40ZR1897Y.Inthis exam-
ple, "97Y"isthe service specifica tion.The
letter "Y"represents thespeed rating. The
maximum speedofthe tire islimi ted to
186 mph (300 km/h).
R The size descriptio nfor alltires withmaxi-
mum speed sof over 186mph (300 km/h)
must include "ZR"and theservice specifica -
tion must begiven inparentheses .Example:
275/40 ZR18 (99 Y).Speed rating"(Y)"
indicates thatthemaximum speedofthe
tire isover 186mph (300 km/h). Askthe
tire manufacture rabou tthe maximum
speed . 322
Al
labout wheelsand tiresWheel sand tires

All-wea
ther tires and wint ertires Inde
x Sp
eed ratin g Q
M+S 1 up
to100mph (160km /h) T
M+S 1 up
to118mph (190km /h) H
M+S 1 up
to130mph (210km /h) V
M+S 1 up
to149mph (240km /h) i
Not
alltires wit hth eM+S markingpro vide
th edriv ingcharac teris tic sof wint ertires. In
addit iontotheM+S marking,wint ertires
also have the004D snowfl ake symb olon the
tir ewall. Tireswit hth is mar kingfulf illthe
req uirem ents of theRubber Manufacturers
As soc iation (RMA )and theRubber Assoc ia-
tio nof Canad a(RAC) regardin gth etir etrac-
tio non snow. They have been especially
dev elope dfor driv ingonsnow.
An elec tron icspee dlimit erpre ven tsyour vehi-
cle from excee dingaspee dof 13 0mph
(21 0km /h).
The spee drat ing oftires moun tedat thefac -
to ry may behigh erthan themax imum speed
th at theelec tron icspee dlimit erper mits.
Mak esure that your tires have thereq uired
spee drat ing ,e.g .when buyingne wtires. The
req uired speedrat ing foryour vehicle can be
foun din the"Tire s"sec tion(Y page 330).
Fur ther inform ationabout readingtiredat a
can beobt aine dfrom any qualif iedspec ialist
work shop.
Load index In
addit iontotheload- bearingindex,load
ind ex0043 may beimpr inted afterthelet ters th
at iden tifyspee drat ing onthesidew allof
th etir e. Spe edrating (Ypage 321).
R Ifno spec ificatio nis give n:no text (as inthe
ex ample above),rep resents ast and ard load
(SL )tir e
R XL orExtra Load :rep resents arein forced
tir e
R Ligh tLoad :rep resents alight loadtire
R C, D, E:rep resents aload rangethat
depen dson themax imum loadthat thetir e
can carryat acer tain pressur e
i Tire
datais veh icle-spec ificand may devi-
ate from thedat ain theex ample .
Ma xim um load ratin g Max
imum tireload 0043isthemax imum permis -
sible weigh tfor whic hth etir eis appr oved.
Do notove rload thetir es by excee dingth e
spec ifiedload limit.The maximum permis sible
load canbefoun don theveh icle'sTire and
Load ingInfor mat ionplac ardontheB- pillar on
th edriv er'sside (Ypage 317).
i The
actual values fortires are vehicle-spe-
cif icand may deviate from thevalues inthe
illust ration .
DOT, TireIdent ification Numb er(TIN ) US
tirereg ulati onsst ipulat eth at eve rytire
man ufactureror ret read ermust imprintaTIN
in or on thesidew allofeach tirepro duce d.
1 Or M+S 004D forwint ertires. All
abou twheels andtires
323Wheels andtires Z