ASTM_F_2871_-_11.pdf

Designation:F287111Standard Specification for245/70R19.5 136/134M Radial Truck Standard Reference TestTire1This standard is issued under the fixed designation F2871;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 specification covers the general requirements forthe 245/70R19.5 136/134M radial truck standard reference testtire.The tire covered by this specification is primarily for useas a reference tire for braking traction,snow traction,and wearperformance evaluations,but may also be used for otherevaluations,such as pavement roughness,noise,or other teststhat require a reference tire.1.1.1 Other standard reference test tires are also used forthese purposes and are referenced in Section 2.1.2 This specification provides a 19.5 rim diameter codestandard truck tire design and construction,standard dimen-sions,and specifies the conditions of storage.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.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:2D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD2240 Test Method for Rubber PropertyDurometer Hard-nessD3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsE867 Terminology Relating to Vehicle-Pavement SystemsE1136 Specification for P195/75R14 Radial Standard Refer-ence Test TireF538 Terminology Relating to the Characteristics and Per-formance of TiresF2493 Specification for P225/60R16 97S Radial StandardReference Test TireF2870 Specification for 315/70R22.5 154/150L RadialTruck Standard Reference Test TireF2872 Specification for 225/75R16C 116/114S M+S RadialLight Truck Standard Reference Test Tire3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification,referto Terminology F538.3.1.2 pavement characteristic,nphysical feature or prop-erty of a pavement surface such as type,roughness,texture,and skid resistance.E8673.1.3 pitch,nunit of tread pattern elements used in variouscombinations to obtain optimum noise levels.F5383.1.4 standard reference test tire,SRTT,ntire that is usedas a control tire or surface-monitoring tire(for example,Specifications E1136,F2493,F2870,F2871,and F2872 tires).F5384.Design and Construction4.1 The 245/70R19.5 136/134M standard reference test tireshall feature the steel-belted radial technology,and a smooth-ribbed tread design,see Fig.1 and Fig.2,with technology asdescribed in Sections 5-7.4.2 The tire shall be designed to conform to the EuropeanTyre and Rim Technical Organisation(ETRTO)dimensionsand tolerances for cross section and overall diameter found inthe current ETRTO Standards Manual.31This specification is under the jurisdiction of ASTM Committee F09 on Tiresand is the direct responsibility of Subcommittee F09.20 on Vehicular Testing.Current edition approved Jan.1,2011.Published March 2011.DOI:10.1520/F2871-11.2For 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.3Available from the European Tyre and Rim Technical Organisation 32/2,avenue Brugmann B-1060 Brussels Belgium.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.3 The tire used for this specification is produced byManufacture Francaise des Pneumatiques Michelin.4The tire isstamped on the sidewall with the words:“Standard ReferenceTest Tire”and“F2871”.5.Materials and Manufacture5.1 The individual standard reference test tires shall con-form to the manufacturers design standards.5.2 Tread compound,fabric processing,and all the steps intire manufacturing shall be controlled to ensure minimumvariability between tires.5.3 The standard reference test tire shall be as originallymolded without any tread grinding or repairs.5.4 Since the formulation for tread compounds are propri-etary,they shall be controlled by means of their physicalproperties given in Table 1.5.5 Dimensions,weights,and permissible variations aregiven in Section 7.5.6 The tire shall be of the following construction:5.6.1 One-ply sidewall construction(steel).5.6.2 A five-ply tread construction(one-ply steel and foursteel belts).5.6.3 Black sidewall.6.Physic