Designation:F2899−11AnAmericanNationalStandardStandardSpecificationforCondition1BicycleForks1ThisstandardisissuedunderthefixeddesignationF2899;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisstandardestablishestestingrequirementsforquali-fyingdesignsusingproductionforksintendedforuseinCondition1perClassificationF2043.2.ReferencedDocuments2.1ASTMStandards:2F2043ClassificationforBicycleUsageF2273TestMethodsforBicycleForks3.Classification3.1Condition1perClassificationF2043.4.SamplingandTestSpecimens4.1SelectionandPreparationofSpecimens:4.1.1Threeforksshallberandomlyselectedfromthefirstproductionlotforthefatigueplusimpacttestperthistestmethod.4.1.2Oneforkshallberandomlyselectedfortheimpacttestperthistestmethod.4.1.3Oneforkshallberandomlyselectedforboththecompressionandbendingtestsperthistestmethod.5.PerformanceRequirements5.1BicycleforksintendedbythemanufacturertobeusedaccordingtoCondition1shallbetestedperTestMethodsF2273.5.1.1CompressionLoadTest(SuspensionForks):5.1.1.1Theforkshallwithstandacompressionloadof2800Nwithoutanycomponentfailure,fractureorpermanentdeformation.5.1.1.2Undertheapplicationofthecompressionloadof2800N,theminimumclearancefromthemaximumtireprofileintendedforusebythemanufacturertothenearestsurfaceofthecrownshallbeatleast3mm.5.1.2BendingLoadTest:5.1.2.1Theforkshallwithstandamaximumbendingloadof1200N(100Ninitialloadplusanadditional1100N).5.1.2.2Thepermanentdeflectionofarigidforkshallnotexceed5mmandthepermanentdeflectionofasuspensionforkshallnotexceed10mm.5.1.3ImpactResistanceTest:5.1.3.1Foreachfork,permanentdeflectionshallbelessthan45mmfollowingimpactofa22.5kgmassdroppedfromaheightsuchthatthevelocityatimpactshallbeatleast3.54m/s.NOTE1—Inafrictionlesssystem,thisvelocitywouldbeachievedforadropheightof640mm.5.1.3.2ForCondition1forks...
