1、Tyres (ply rating marked series) and rims for agricultural tractors and machinesPart 1: Tyre designation and dimensions, and approved rim contoursBS ISO 42511:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Tyres (ply rating marked series) and rims for a
2、gricultural tractors and machines Part 1: Tyre designation and dimensions, and approved rim contoursPneumatiques (srie marquage “PR”) et jantes pour tracteurs et machines agricoles Partie 1: Dsignation et cotes des pneumatiques et profils de jantes approuvsINTERNATIONAL STANDARDISO4251-1Seventh edit
3、ion2017-04Reference numberISO 4251-1:2017(E)National forewordThis British Standard is the UK implementation of ISO 42511:2017. It supersedes BS ISO 42511:2005+A1:2012, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee AUE/4, Tyres and wheels for motor ve
4、hicles.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.ISBN 978 0 580 82156 1ICS 83.160.30; 65.060.01Compliance
5、 with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2017.Amendments/corrigenda issued since publicationDate Text affected BRITISH STANDARDBS ISO 42511:2017 ISO 2017Tyr
6、es (ply rating marked series) and rims for agricultural tractors and machines Part 1: Tyre designation and dimensions, and approved rim contoursPneumatiques (srie marquage “PR”) et jantes pour tracteurs et machines agricoles Partie 1: Dsignation et cotes des pneumatiques et profils de jantes approuv
7、sINTERNATIONAL STANDARDISO4251-1Seventh edition2017-04Reference numberISO 4251-1:2017(E)BS ISO 42511:2017ISO 4251-1:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be
8、 reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the req
9、uester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 42511:2017ISO 4251-1:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights res
10、erved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either I
11、SO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgISO 4251-1:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms an
12、d definitions . 14 Marking 14.1 Tyre size designation . 14.2 Load rating 24.3 Categories of use 24.3.1 Agricultural drive wheels Tractor tyres 24.3.2 Agricultural steering wheels Tractor tyres 24.3.3 Agricultural implement tyres 24.4 Additional information 24.5 Pictogram for maximum tyre bead seatin
13、g pressure (optional) 35 Dimensions and tolerances . 35.1 Agricultural drive wheels Tractor tyres . 35.2 Agricultural steering wheels Tractor tyres . 45.3 Agricultural implement tyres . 46 Tyre dimension parameters for vehicle speed reference 46.1 Speed radius index . 46.2 Rolling circumference inde
14、x 47 Tyre and rim coordination . 48 Tubes 4Annex A (informative) Tyres with nominal rim diameter codes 15.3, 16.1 and tyres for small tractors 16Annex B (informative) Comparison values for rolling circumference (RC), rolling circumference index (RCI), speed radius index (SRI) .19Bibliography .21 ISO
15、 2017 All rights reserved iiiContents PageBS ISO 42511:2017ISO 4251-1:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO
16、technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates clo
17、sely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria
18、needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of p
19、atent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name
20、 used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO)
21、principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by ISO/TC 31, Tyres, rim and valves, Subcommittee SC 5, Agricultural tyres and rims.This seventh edition cancels and replaces the sixth edition (ISO 4251-1:2005) w
22、hich has been technically revised. It also replaces ISO 4251-1:2005/Amd1: 2012.The seventh edition contains the following main changes: pictogram for maximum tyre bead seating pressure; tyre dimension parameters for vehicle speed reference; tables updated incorporating Amendment 1; Annex A updated a
23、dding tyres for small tractors; new Annex B with the comparison values for rolling circumference (RC), rolling circumference index (RCI), speed radius index (SRI).iv ISO 2017 All rights reservedBS ISO 42511:2017ISO 4251-1:2017(E)ForewordISO (the International Organization for Standardization) is a w
24、orldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented
25、on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this
26、 document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Dir
27、ectives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the de
28、velopment of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of
29、 ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by ISO/TC 3
30、1, Tyres, rim and valves, Subcommittee SC 5, Agricultural tyres and rims.This seventh edition cancels and replaces the sixth edition (ISO 4251-1:2005) which has been technically revised. It also replaces ISO 4251-1:2005/Amd1: 2012.The seventh edition contains the following main changes: pictogram fo
31、r maximum tyre bead seating pressure; tyre dimension parameters for vehicle speed reference; tables updated incorporating Amendment 1; Annex A updated adding tyres for small tractors; new Annex B with the comparison values for rolling circumference (RC), rolling circumference index (RCI), speed radi
32、us index (SRI).iv ISO 2017 All rights reserved INTERNATIONAL STANDARD ISO 4251-1:2017(E)Tyres (ply rating marked series) and rims for agricultural tractors and machines Part 1: Tyre designation and dimensions, and approved rim contours1 ScopeThis document establishes the designation in use and the d
33、imensions of the ply rating marked series of tyres for agricultural tractors and machines.Tyre load ratings are given in ISO 4251-2.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For
34、 dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 4223-1, Definitions of some terms used in the tyre industry Part 1: Pneumatic tyresISO 188051), Tyre classification Agricultural, forestry a
35、nd construction machines3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 4223-1 apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/
36、 ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp4 MarkingThe marking of the ply rating marked series of tyres consists of the designation of tyre size and load rating, and any additional information. See 4.1 to 4.4.4.1 Tyre size designationThe present size marking for the id
37、entification of tyres consists of the nominal tyre width code and the nominal rim diameter code.EXAMPLE 1 Tyre 13.6 28Tyre 6.50 161) To be published. ISO 2017 All rights reserved 1BS ISO 42511:2017ISO 4251-1:2017(E)For tyres of radial construction, the letter R replaces the dash.EXAMPLE 2 Tyre 8.3 R
38、 44For low section height tyres, the letter L is added to the nominal tyre width code.EXAMPLE 3 Tyre 9.5L 15For low section height tractor steering wheel tyres of diagonal construction, an optional marking may be used in the following manner:Nominal tyre width code/nominal aspect ratio nominal rim d
39、iameterEXAMPLE 4 Tyre 9.5/85 154.2 Load ratingThe present marking of load rating comprises the ply rating.EXAMPLE Tyre 13.6 28 8PR4.3 Categories of use4.3.1 Agricultural drive wheels Tractor tyresThe classification code R, as specified in ISO 18805, may be optionally marked at the tyre sidewall.4.3.
40、2 Agricultural steering wheels Tractor tyresThe classification code F, as specified in ISO 18805, may be optionally marked on the tyre sidewall. In addition, the letters “FRONT” or “SL” may be marked after the nominal rim diameter code on the tyre.4.3.3 Agricultural implement tyresThe classification
41、 code I, as specified in ISO 18805, shall be marked on the tyre sidewall, along with an optional marking “IMPLEMENT” or “IMP” or “SL” suffix.EXAMPLE4.0012 IMP 4.0012 IMPLEMENT4.0012 SL IMPLEMENT4.4 Additional informationTubeless tyres shall be marked with the word “TUBELESS”.Additionally, classifica
42、tion code markings including tyre classifications may be used as described in ISO 18805, but they are not part of the type size designation of the tyre.In the case of a preferred direction of rotation of the tyre, an arrow shall be used to indicate that direction.2 ISO 2017 All rights reservedBS ISO
43、 42511:2017ISO 4251-1:2017(E)For tyres of radial construction, the letter R replaces the dash.EXAMPLE 2 Tyre 8.3 R 44For low section height tyres, the letter L is added to the nominal tyre width code.EXAMPLE 3 Tyre 9.5L 15For low section height tractor steering wheel tyres of diagonal construction,
44、an optional marking may be used in the following manner:Nominal tyre width code/nominal aspect ratio nominal rim diameterEXAMPLE 4 Tyre 9.5/85 154.2 Load ratingThe present marking of load rating comprises the ply rating.EXAMPLE Tyre 13.6 28 8PR4.3 Categories of use4.3.1 Agricultural drive wheels Tra
45、ctor tyresThe classification code R, as specified in ISO 18805, may be optionally marked at the tyre sidewall.4.3.2 Agricultural steering wheels Tractor tyresThe classification code F, as specified in ISO 18805, may be optionally marked on the tyre sidewall. In addition, the letters “FRONT” or “SL”
46、may be marked after the nominal rim diameter code on the tyre.4.3.3 Agricultural implement tyresThe classification code I, as specified in ISO 18805, shall be marked on the tyre sidewall, along with an optional marking “IMPLEMENT” or “IMP” or “SL” suffix.EXAMPLE4.0012 IMP 4.0012 IMPLEMENT4.0012 SL I
47、MPLEMENT4.4 Additional informationTubeless tyres shall be marked with the word “TUBELESS”.Additionally, classification code markings including tyre classifications may be used as described in ISO 18805, but they are not part of the type size designation of the tyre.In the case of a preferred directi
48、on of rotation of the tyre, an arrow shall be used to indicate that direction.2 ISO 2017 All rights reserved ISO 4251-1:2017(E)4.5 Pictogram for maximum tyre bead seating pressure (optional)The inscription “XXX kPa MAX” inside the pictogram (Figure 1) indicates the maximum cold inflation pressure th
49、at shall not be exceeded for bead seating during tyre mounting. The value of the tyre bead seating pressure is determined by the tyre manufacturer.Figure 1 shows an example of the pictogram to be marked on both sidewalls of the tyre.Figure 1 Pictogram for the maximum bead seating inflation pressure5 Dimensions and tolerances5.1 Agricultural drive wheels Tractor tyresTyre size designations, measurement rims, design dimensions of new tyres, and maximum tyre d
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