Designation:F2663−15StandardTestMethodforBeadUnseatingofTubelessPassengerandLightTruckTires1ThisstandardisissuedunderthefixeddesignationF2663;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthestaticnon-rollinglaboratorymethodofdeterminationofatubelesstire’sresistancetobeadunseating.Thetestrequirestheuseofastandardizedfixtureandloadmachine.Thetestisconductedusingadefinedtestpressureandmethodofdeterminingtheresultantforcetounseatthetirefromtherim.1.2Thistestmethodisapplicableforallpassenger,lighttruck,andtemporarysparetires.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2F538TerminologyRelatingtotheCharacteristicsandPer-formanceofTiresF1502TestMethodforStaticMeasurementsonTiresforPassengerCars,LightTrucks,andMediumDutyVehicles3.Terminology3.1Definitions:3.1.1bead,ofatire,n—partofatirethatcomesincontactwiththerimandisshapedtosecurethetiretotherim.F5383.1.2beadunseatingblock,n—machinedblockofcastaluminumusedonthebeadunseatingfixturetopressagainstthetiresidewall.F5383.1.3manufacturer,n—ofatire,thenameofacompanyorwhollyownedsubsidiarymakingthetire.F5383.1.4measuringrim,n—any“rim”withawidthasspecifiedforthedesignormeasuringrimforaparticulartiresizedesignation,andwiththe“bead”seatandflangedimensionsinaccordancewithpublicationsoftireandrimstandardsorgani-zationscurrentatthetimeofmanufacture.F5383.1.5outsidediameter,n—themaximumdiameterofatirewhenitismountedandinflated.F5383.1.6overallwidth,n—them...
