ASTM_F_2663_-_15.pdf

Designation:F266315Standard Test Method forBead Unseating of Tubeless Passenger and Light TruckTires1This standard is issued under the fixed designation F2663;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the static non-rolling laboratorymethod of determination of a tubeless tires resistance to beadunseating.The test requires the use of a standardized fixtureand load machine.The test is conducted using a defined testpressure and method of determining the resultant force tounseat the tire from the rim.1.2 This test method is applicable for all passenger,lighttruck,and temporary spare tires.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2F538 Terminology Relating to the Characteristics and Per-formance of TiresF1502 Test Method for Static Measurements on Tires forPassenger Cars,Light Trucks,and Medium Duty Vehicles3.Terminology3.1 Definitions:3.1.1 bead,of a tire,npart of a tire that comes in contactwith the rim and is shaped to secure the tire to the rim.F5383.1.2 bead unseating block,nmachined block of castaluminum used on the bead unseating fixture to press againstthe tire sidewall.F5383.1.3 manufacturer,nof a tire,the name of a company orwholly owned subsidiary making the tire.F5383.1.4 measuring rim,nany“rim”with a width as specifiedfor the design or measuring rim for a particular tire sizedesignation,and with the“bead”seat and flange dimensions inaccordance with publications of tire and rim standards organi-zations current at the time of manufacture.F5383.1.5 outside diameter,nthe maximum diameter of a tirewhen it is mounted and inflated.F5383.1.6 overall width,nthe maximum cross-sectional widthof a tire,including protective or decorative ribs.F5383.1.7 rim,nthe specially shaped circular periphery towhich a tire may be mounted with appropriate bead fitment.F5383.1.8 rim,test,na rim having the configuration anddimensions suitable for use with a test tire in accordance withpublications of a tire and rim standards organization current atthe time of tire manufacture.F5383.1.9 sidewall,of a tire,nthat portion of a tire between thetread and the bead.F5383.1.10 specified design section width,nwidth specified inthe publications of tire and rim standards organizations currentat the time of manufacture for a new tire of that sizedesignation and type when inflated on its“measuring rim.”F5383.1.11 tire,light truck,na tire of a group prescribed in“Light Truck”or“Commercial”tire sections of industrystandards manuals such as The European Tyre and RimTechnical Organisation(ETRTO),Japan Automobile TyreManufacturers Association(JATMA),and The Tire and RimAssociation(TRA).The tire will typically have either“LT”or“C”(C-type)as part of the tire size designation.3.1.11.1 DiscussionAn LT tire is a light truck tire with theletters“LT”either as a prefix or suffix of the tire sizenomenclature.These tires are typically standardized byJATMAor TRA.AC-type tire is a light truck(commercial)tirewith the letter“C”as a suffix to the tire size nomenclature.These tires are standardized by ETRTO,and located in the“Commercial”tire section of the Standards Manual.3.1.12 tire,passenger car,na tire of a group prescribed ina passenger tire section of industry standards manuals such as1This test method is under the jurisdiction of ASTM Committee F09 on Tiresand is the direct responsibility of Subcommittee F09.30 on Laboratory(Non-Vehicular)Testing.Current edition approved June 1,2015.Published July 2015.Originally approvedin 2007.Last previous edition approved in 2007 as F2663 07a.DOI:10.1520/F2663-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 The European Tyre and Rim Technical Organisation(ETRTO),Japan Automobile Tyre Manufacturers Association(JATMA),or The Tire and Rim Association(TRA).3.1.13 tire,pneumatic,na hollow tire that becomes load-bearing upon inflation with air,or other gas,to a pressureabove atmospheric.F5383.1.14 tread,of a tire,nthe part of the tire that comes incontact with the ground.F5383.1.15 unseating,vthe dislodgment of the bead area of atire from the portion of t