tyre pressure PORSCHE 911 CARRERA 2003 4.G Owners Manual

Temperature
A,B,C
ThetemperaturegradesareA(thehighest),B
andC,representingthetire'sresistancetothe
generationofheatanditsabilitytodissipate
heatwhentestedundercontrolledconditionson
aspecifiedindoorlaboratorytestwheel.
Sustainedhightemperaturescancausethema-
terialofthetiretodegenerateandreducetire
life,andexcessivetemperaturecanleadtosud-
dentirefailure.
ThegradeCcorrespondstoalevelofperfor-
mancewhichallpassengercartiresmustmeet
undertheFederalMotorVehicleSafetyStandard
No.109.
GradesBandArepresenthigherlevelsofper-
formanceonthelaboratorytestwheelthanthe
minimumrequiredbylaw.
A
Warning!
Thetemperaturegradeforthistireisestab-
lishedforatirethatisproperlyinflatedandnot
overloaded.
Excessivespeed,underinflation,orexcessive
loading,eitherseparatelyorincombination,can
causeheatbuildupandpossibletirefailure.
Tirepressures
A
Warning!
Incorrecttirepressurecausesincreased
tirewearandadverselyaffectsroadhand-
ling.
I>Alwaysuseanaccuratetirepressuregauge
whencheckinginflationpressures.
I>Donotexceedthemaximumtirepressure
listedonthetiresidewall.(Alsoreferto"Tech-
nicaldata").
I>Coldtireinflationpressuremeans:alltires
mustbecold,ambienttemperaturemaximum

68°F
(20°C),whenadjustingtheinflation
pressure.
Avoidsunlightstrikingthetiresbefore
measuringcoldpressures,sincethepress-
ureswouldrisefromtemperatureinfluence.
I>Valvecapsprotectthevalvefromdustand
dirt,andthusfromleakage.
Alwaysscrewcapstightlydown.
Replacemissingcapsimmediately.
I>Forsafetyreasons,don'tusetireinflating
bottles.

Tiretraction

A
Warning!
Whendrivingonwetorslushyroads,a
wedgeofwatermaybuild
up
betweenthe
tiresandtheroad.Thisphenomenonis
knownas"hydroplane"andmaycausepar-
tialorcompletelossoftraction,vehicle
controlorstoppingability.
I>Reducespeedonwetsurfacetopreventthis.

Tirelife

Tirelifedependsonvariousfactors,i.e.,road
surfaces,trafficandweatherconditions,driving
habits,typeoftiresandtirecare.
I>Inspectyourtiresforwearanddamagebe-
foredrivingoff.Ifyounoticeunevenorsub-
stantialwear,wheelsmightneedalignmentor
tiresshouldbebalancedorreplaced.
I>I>I>
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Tiredamage,puncture

I>Checktiresforimbeddedmaterial,cuts,punc-
tures,cracksandbulges(sidewall)before
drivingoff.
Incaseoftiredamage,whereitisuncertain
whetherthereisabreakintheplywithallits
consequencesortiredamagecausedbyther-
malormechanicaloverloadingduetolossof
pressureoranyotherpriordamage,werecom-
mendthatthetirebereplacedforsafetyrea-
sons.
Ifonefaultytireisreplaceditshouldbenoted
thatthedifferenceintreaddepthononeaxle
mustnotexceed30%.
Handlinginconsistenciesmayresult.
I>Performavisualinspectionifnecessary.

Tirereplacements

Ifindoubt,contactyourPorschedealeror
PorscheImporterofyourcountry.
Useonlytiremakesandtypestestedby
Porsche.

IfyoudonotuseaPorscherecommended
replacementtire,makesurethatyoupur-
chaseyournewtiresfromareputabletire
dealerandthatthedealercomplieswithall
manufacturerswarningsforthosetires.
Onlytireswiththesamemakeandwiththe
samespecificationcode(e.g."NO","Nl"...)
canbemounted.
Beforemountingnewtires,checkwithyour
Porschedealeraboutthecurrentrelease
status.
Usetireswith"ZR"qualitystandards.
There
arecurrentlynostandardsconcerningtire
strengthatspeedsabove150mph
(240
kmjhJ.
Tiresshouldbereplacednolessthanononeaxleat
thetime.
Onlytiresofthesamemakeandtypemustbeused.
Mixedtiresarenotpermissible.
Initially,newtiresdonothavetheirfulltraction.
Youshouldthereforedriveatmoderatespeeds
duringthefirst
60-120
miles(100-200kmJ.
Ifnewtiresareinstalledonlyononeaxle,ano-
ticeablechangeinhandlingoccursduetothe
differenttreaddepthoftheothertires.
Thishappensespeciallyifonlyreartiresarere-
placed.However,thisconditiondisappearsas
thenewtiresarebrokenin.
I>Pleaseadjustyourdrivingstyleaccordingly.
Installationofnewtiresshouldonlybedoneby
aqualifiedtiretechnician.

Valves

Rubbervalvestemsmustbereplacedevery
timeatireisreplaced.
Forsteelvalves,theinstallationandreplacement
instructionsmustbeobserved.
UseonlygenuinePorschesteelvalves.

Parkingatthecurb
A
Warning!
Hardimpactsagainstcurbs(ortraffic
islands)aredangerousandmaycausehid-
dentiredamagewhichisnotnoticeable
untillater.Suchdamagecanresultinacci-
dentsathighspeedscausingsevereper-
sonalinjury.
Dependingontheforceofimpact,theedge
oftherimcanalso
bedamaged.
I>Ifyouareindoubt,havethewheelchecked
byanexpert,particularlyifyoususpectdam-
ageontheinside.
I>Ifyoumustdriveoveracurborotherob-
stacle,driveslowlyandatanobtuseangle.
Exercisecarewhenparkingalongcurbs.
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A.Warning!
Riskofanaccident.
Forsafetyreasons,thefollowinginstruc-
tionsfortheuseofthesparewheelmust
befollowedexactly.
I>Refertothechapter"Spacerrings"before
fittingthesparewheel.
Ifincorrectlyfitted,thesparewheelmay
comeoffwhilstdriving.
I>Checkthetirefillingpressureimmediately
afterfittingthesparewheel.
I>Thesparewheelmustbeusedonlyover
shortdistancesincasesofemergency.
Afterrepairorreplacement,re-mountthe
roadwheelandtireassoonaspossible.
I>Avoidrapidacceleration,hardbrakingand
highcorneringspeedstopreventlossofve-
hiclecontrol.
Themaximumpermittedspeedis50mphj
80km/handmustnotbeexceededbecause
ofaltereddrivingcharacteristicsandforrea-
sonsofwear.
Thetreaddepthofthesparewheelissubject
tothesamelawsastheoriginaltires.
I>Thevehiclemustbefittedwithonlyone
sparewheel.
I>Donotuseasparewheelfromothervehicles
onyourcar.
Likewise,thesparewheelfromyourvehicle
mustnotbeusedonothercars.
I>Toavoiddamage,donotuseautomaticcar
washeswhenthesparewheelisinstalled.

Spacer
Rings
A.Warning!
Risk
of
accident.
Ifincorrectlyfitted,the
sparewheelmaycomeoffwhiledriving
whichcouldresultinseriouspersonalinjury
ordeath.
I>5mmspacerringsonfrontandrear
axles:
If5mmspacer
ringsarefittedtothewheel
hubs,
donotremove
thesebeforefittingthe
sparewheel.

I>17mmspacerringsonrearaxle:
If17mmspacer
ringsarefittedtothewheel
hubs,theappropriatespacerringmustbe
removedbeforethesparewheelisfitted.
Tomountthesparewheel,usethewheel
boltswhichwereusedtofastenthespacer
ring.
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