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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 50-1.6.1c:2002 ISO 5751-1:2001 Tyres and wheels Part 1: Tyres Section 6: Motorcycle tyres Subsection 6.1c: Specification of general requirements and design guide for designations, dimensions and load ratings for metric series tyres ICS 83.160.10 NO COPYING WI
2、THOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:13:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1.6.1c:2002 This British Standard, having been prepared under the direction of the Engineering
3、Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 12 March 2002 BSI 12 March 2002 ISBN 0 580 39116 7 National foreword This British Standard reproduces verbatim ISO 5751-1:2001 and implements it as the UK national standard. It s
4、upersedes BS AU 50-1.6.1b:1995 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AUE/4, Tyres and wheels for motor vehicles, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secreta
5、ry. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards E
6、lectronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to und
7、erstand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document compri
8、ses a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 14, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy:
9、London South Bank University, London South Bank University, Sat Dec 09 02:13:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 5751-1:2001(E) INTERNATIONAL STANDARD ISO 5751-1 Fifth edition 2001-12-15 Motorcycle tyres and rims (metric series) Part 1: Design guides Pneumatiques et ja
10、ntes pour motocycles (sries millimtriques) Partie 1: Guide de conception BS AU 501.6.1c:2002 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:13:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii BS AU 501.6.1c:2002 Licensed Copy: London South Bank University, L
11、ondon South Bank University, Sat Dec 09 02:13:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 5751-1:2001(E) iii Contents Page Foreword.iv 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Tyre designation1 5 Tyre dimensions 5 6 Tread configurations.7 7 Tyre load-carrying capacity8 8 S
12、peed symbols 10 9 Centrifugal radius11 Annex A (informative) Guideline values for metric series 12 Bibliography14 BS AU 501.6.1c:2002 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:13:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 5751-1:2001(E) iv Forewo
13、rd ISO (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 technical committees. Each member body interested in a subject for which a technic
14、al 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 closely with the International Electrotechnical Commission (IEC) on all matters of el
15、ectrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to t
16、he member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this part of ISO 5751 may be the subject of patent rights. ISO shall not be held responsibl
17、e for identifying any or all such patent rights. ISO 5751-1 was prepared by Technical Committee ISO/TC 31, Tyres, rims and valves, Subcommittee SC 10, Cycle, moped, motorcycle tyres and rims. This fifth edition cancels and replaces the fourth edition (ISO 5751-1:1994), which has been technically rev
18、ised. ISO 5751 consists of the following parts, under the general title Motorcycle tyres and rims (metric series): Part 1: Design guides Part 2: Tyre dimensions and load-carrying capacities Part 3: Range of approved rim contours Annex A of this part of ISO 5751 is for information only. BS AU 501.6.1
19、c:2002 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:13:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTENRATIONALTS ANDA DRIS-1575 O1:(1002)E I SO 1002 All irthgs ersedevr 1 Motorcycle tyres and rims (metric series) Part 1: Design guides 1 Scope This part
20、 of ISO 5751 gives guidelines for the design and specifies the designation, the calculation of dimensions and the load-carrying capacity of metric-series motorcycle tyres. This part of ISO 5751 is applicable to motorcycle tyres with a reduced height/width ratio (100 and lower) that can be fitted on
21、cylindrical bead seat rims or 5 tapered bead seat rims. It is also applicable to other concepts of tyre and rim, in which case, however, the appropriate rim/section ratios and coefficients will have to be established. NOTE See ISO 4249 for requirements covering motorcycle tyres and rims (code-design
22、ated series) of rim diameter code 13 and above, and ISO 6054 for those of code 12 and below. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 5751. For dated references, subsequent amendments
23、to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 5751 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the
24、normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 4000-2, Passenger car tyres and rims Part 2: Rims ISO 4223-1, Definitions of some terms used in the tyre industry Part 1: Pneumatic tyres ISO 4251-3, Tyres (ply rating ma
25、rked series) and rims for agricultural tractors and machines Part 3: Rims 3 Terms and definitions For the purposes of this part of ISO 5751, the terms and definitions given in ISO 4223-1 apply. 4 Tyre designation 4.1 General The designation of the tyre shall be shown on its sidewall and shall includ
26、e the following markings, placed close to each other: size and construction (see 4.2); service description (see 4.3). BS AU 501.6.1c:2002 1 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:13:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-1575 O1:(1002)E 2 I
27、SO 1002 Allir thgser sedevr 4.2 Size and construction 4.2.1 Characteristics The size and construction characteristics shall be indicated as follows: Nominal section width Nominal aspect ratio Tyre construction code Nominal rim diameter code 4.2.2 Nominal section width The nominal section width shall
28、 be expressed in millimetres. 4.2.3 Nominal aspect ratio The nominal aspect ratio shall be expressed as a percentage. It shall be a multiple of 10 for aspect ratios 70 and higher, and a multiple of 5 for aspect ratios lower than 70. 4.2.4 Tyre construction code The tyre construction code shall be “B
29、” for bias belted type constructions, “-” for diagonal ply tyres, and “R” for radial ply tyres. NOTE 1 See also 4.4.3. Other codes will be established for new concepts (constructions) of tyres. NOTE 2 The term “bias belted construction” describes a pneumatic tyre structure of diagonal (bias ply) typ
30、e in which the carcass is restricted by a substantially inextensible circumferential belt NOTE 3 With reference to the definition of radial ply tyre given in ISO 4223-1, for the purposes of this part of ISO 5751, “substantially at 90” means angles between 70 and 90 as measured from the centreline of
31、 the tread. 4.2.5 Nominal rim diameter The nominal rim diameter shall normally be expressed by a code (see Table 1). However, it shall be expressed in millimetres for new and future concepts where the application either of existing tyres on new-concept rims or of new-concept tyres on existing rims w
32、ould be incompatible. 4.3 Service description The characteristics shall be indicated as follows: Load index Speed symbol The load index is a numerical code associated with the maximum load a tyre can carry at the speed indicated by its speed symbol under the conditions specified in clause 7 (see Tab
33、le 3). The speed symbol indicates the speed category in which the tyre can carry the load corresponding to its load index under the service conditions specified in clause 7 (see Table 4). BS AU 501.6.1c:2002 2 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:1
34、3:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-1575 O1:(1002)E I SO 1002 All irthgs ersedevr 3 Table 1 Nominal rim diameter and rim width codes Dimensions in millimetres Nominal rim diameter code Rim width code Code Nominal rim diameter Dr Code Measuring rim width Rm 8 10 12 13 M/C 14 M/C 15 M/C
35、 16 M/C 17 M/C 18 M/C 19 M/C 20 M/C 21 M/C 23 M/C 203 254 305 330 356 381 406 432 457 483 508 533 584 1.50 1.60 1.85 2.15 2.50 2.75 3.00 3.50 3.75 4.00 4.50 5.00 5.50 6.00 6.25 6.50 7.00 38 40,5 47 55 63,5 70 76 89 95 101,5 114,5 127 139,5 152,5 159 165 178 4.4 Other service characteristics 4.4.1 In
36、 the case of tubeless tyres, the marking “TUBELESS” shall be shown on the tyre. 4.4.2 In the case of a preferred direction of rotation of the tyre, an arrow shall be used to indicate that direction. 4.4.3 Tyres designed for vehicles having a maximum speed capacity in excess of 240 km/h shall be iden
37、tified by means of the code letters “VB” or “ZB” for bias-belted construction, “VR” or “ZR” for radial construction, where “ZB” and “ZR” should be used for newly designed motorcycles with a maximum speed over 240 km/h. This identification shall be placed inside the tyre designation (see 4.2) instead
38、 of in the tyre construction code. For speed category “V”, “VB” or “VR” tyres suitable for speeds of over 240 km/h, a service description with the speed symbol “V” shall be marked in parentheses. EXAMPLE 1 120/60 VR 17 (55 V) For speed category “ZB” or “ZR” tyres suitable for speeds up to 270 km/h,
39、a service description with the speed symbol “W” shall be marked. EXAMPLE 2 120/60 ZR 17 55 W BS AU 501.6.1c:2002 3 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:13:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-1575 O1:(1002)E 4 ISO 1002 Allir thgser sede
40、vr If the same tyres are suitable for speeds of over 270 km/h, the service description shall be marked in parentheses. EXAMPLE 3 120/60 ZR 17 (55 W) 4.4.4 For nominal rim diameter codes 13 and above, the suffix “M/C” shall be added to the size and construction marking, to prevent confusion and misfi
41、tting of motorcycle tyres on rims having the same nominal diameters but designed primarily for passenger car tyres in accordance with ISO 4000-2 or agricultural tyres in accordance with ISO 4251-3. 4.4.5 The maximum speed approved by the tyre manufacturer may be marked on the tyre. EXAMPLE “V250” to
42、 identify a maximum speed of 250 km/h. 4.4.6 The symbol “MST” may be used to identify special service tyres. 4.4.7 The symbol “DP” may be used to identify tread type C tyres. 4.5 Examples 4.5.1 A motorcycle tyre having a) a size and construction of nominal section width, 120 mm, nominal aspect ratio
43、, 80, diagonal construction, and nominal rim diameter code 18, with b) a service description consisting of a load-carrying capacity of 290 kg, corresponding to load index “65”, and a maximum speed of 180 km/h, corresponding to speed symbol “S”, shall be marked: 4.5.2 A motorcycle tyre having a) a si
44、ze and construction of nominal section width, 140 mm, nominal aspect ratio, 70, radial construction, and nominal rim diameter code 17, with b) a service description consisting of a reference speed in excess of 240 km/h (code letter “ZR”), a reference load-carrying capacity of 300 kg, corresponding t
45、o load index “66”, and BS AU 501.6.1c:2002 4 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:13:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-1575 O1:(1002)E I SO 1002 All irthgs ersedevr 5 a maximum speed of 270 km/h, corresponding to speed symbol “W”, sh
46、all be marked: In the case of “VR” and “VB” tyres approved for speeds in excess of 240 km/h or “ZR” and “ZB” tyres approved for speeds in excess of 270 km/h, the service description shall be marked in parentheses. EXAMPLE 1 140/70 ZR 17 M/C (66 W) The actual maximum speed certified by the tyre manuf
47、acturer may be marked on the tyre. EXAMPLE 2 “V280” to identify a maximum speed of 280 km/h. 5 Tyre dimensions 5.1 Calculation of design tyre dimensions 5.1.1 Theoretical rim width, Rth The theoretical rim width, Rth, shall be calculated as follows: th1 N RK S= where K1 is the rim/section ratio; SN
48、is the nominal section width. For tyres of existing concepts, K1 shall be equal to 0,6 for aspect ratios 100, 90, 80, 0,7 for aspect ratios 70, 65, 60, and 0,8 for aspect ratios 55, 50. NOTE K1 will be defined later for aspect ratios below 50. 5.1.2 Measuring rim width, Rm The measuring rim width, R
49、m, is the width of the existing rim nearest to Rth. See Table 1 for widths of existing rims. 5.1.3 Design tyre section width, S The design tyre section width, S, shall be the nominal section width, SN, transferred from Rth to Rm, calculated as follows: () N2mth SSKRR=+- rounded to the nearest whole number. BS AU 501.6.1c:2002 5 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:13:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-1575 O1:(