Designation:F551/F551M−09aStandardPracticeforUsinga1.707-m[67.23-in.]DiameterLaboratoryTestRoadwheelinTestingTires1ThisstandardisissuedunderthefixeddesignationF551/F551M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstherequirementsfora1.707-m[67.23-in.]diameterlaboratoryroadwheelfordurabilityandendurancetestingoftiresundercontrolledoperatingandenvironmentalconditions.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecificprecautionarystatements,seeSection7andNote1.2.ReferencedDocuments2.1ASTMStandards:2F538TerminologyRelatingtotheCharacteristicsandPer-formanceofTires3.Terminology3.1Definitions—DefinitionsgiveninTerminologyF538areregardedasstandard.4.SummaryofPractice4.1Thispracticedescribesthespecificationsanddimen-sionsofa1.707-m[67.23-in.]diameterlaboratoryroadwheelsystemfortestingofoneormoretireassembliesundercontrolledconditions.Italsodescribesthecalibrationproce-duresforthestandardoperationofthewheel.5.SignificanceandUse5.1The1.707-m[67.23-in.]diameterlaboratorytestroad-wheelisoneofthemostextensivelyemployedtestingdevicesfortiredurabilityandendurancetesting.5.2Thistestapparatusoperatinginthelaboratoryatcon-trolledsurfacespeeds,loads,andambienttemperaturessimu-lates,toadegree,tire-operatingconditionsresemblingactualservice.Becauseoftheroadwheelcurvature,thetesttireis...
