1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 5751-1:2010Motorcycle tyres and rims(metric series)Part 1: Design guidesBS ISO 5751-1:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation
2、of ISO 5751-1:2010. Itsupersedes BS ISO 5751-1:2004 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee AUE/4, Tyres and wheels for motor vehicles.A list of organizations represented on this committee can beobtained on request to its secretary.This publicat
3、ion does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 67624 6ICS 43.140; 83.160.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under th
4、e authority of theStandards Policy and Strategy Committee on 30 November 2010.Amendments issued since publicationDate Text affectedBS ISO 5751-1:2010Reference numberISO 5751-1:2010(E)ISO 2010INTERNATIONAL STANDARD ISO5751-1Seventh edition2010-11-15Motorcycle tyres and rims (metric series) Part 1: De
5、sign guides Pneumatiques et jantes pour motocycles (sries millimtriques) Partie 1: Guide de conception BS ISO 5751-1:2010ISO 5751-1:2010(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edi
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10、opyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedBS ISO 5751-1:2010ISO 5751-1:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Tyre designation1 4.1 General .1 4.2 Size and construct
11、ion .2 4.3 Service description .2 4.4 Other service characteristics .3 4.5 Designation examples.4 5 Tyre dimensions5 5.1 Calculation of design tyre dimensions .5 5.2 Calculation of maximum overall tyre dimensions in service6 5.3 Calculation of minimum dimensions Section width, Smin.7 5.4 Measuring t
12、yre dimensions Procedure 7 6 Tread configurations.7 7 Tyre load-carrying capacity9 8 Speed symbols 9 9 Centrifugal radius9 Annex A (informative) Guideline values for metric series11 Bibliography14 BS ISO 5751-1:2010ISO 5751-1:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Org
13、anization 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 technical committee has been establi
14、shed 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 electrotechnical standardizatio
15、n. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
16、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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such pat
17、ent 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 seventh edition cancels and replaces the sixth edition (ISO 5751-1:2004, including ISO 5751-1:2004/Cor.1:2006), which has been technically r
18、evised. 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 BS ISO 5751-1:2010INTERNATIONAL STANDARD ISO 5751-1:2010(E) ISO 2010
19、All rights reserved 1Motorcycle tyres and rims (metric series) Part 1: Design guides 1 Scope This part of ISO 5751 gives guidelines for the design of, and specifies the designation and calculation of the dimensions for metric series motorcycle tyres. It is applicable to motorcycle tyres with a reduc
20、ed height/width ratio (100 and lower) that can be fitted on cylindrical bead-seat or 5 tapered bead-seat rims. It is also applicable to other concepts of tyre and rim, provided the appropriate rim/section ratios and coefficients are established for them. NOTE See ISO 4249 for motorcycle tyres and ri
21、ms (code-designated series) of rim diameter codes 13 and above, and ISO 6054 for those of codes 12 and below. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references
22、, the latest edition of the referenced document (including any amendments) applies. ISO 4223-1:2002, Definitions of some terms used in the tyre industry Part 1: Pneumatic tyres ISO 4249-3, Motorcycle tyres and rims (code-designated series) Part 3: Rims 3 Terms and definitions For the purposes of thi
23、s document, 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 include the following markings, placed close to each other: size and construction (see 4.2); service description (see 4.3). BS ISO 5751
24、-1:2010ISO 5751-1:2010(E) 2 ISO 2010 All rights reserved4.2 Size and construction 4.2.1 Characteristics The size and construction characteristics shall be indicated as follows: 4.2.2 Nominal section width The nominal section width shall be expressed in millimetres. 4.2.3 Nominal aspect ratio The nom
25、inal aspect ratio shall be expressed as a percentage. It shall be a multiple of 10 for aspect ratios 80 and higher, and a multiple of 5 for aspect ratios lower than 80. 4.2.4 Tyre construction code The tyre construction code shall be: “B” for bias-belted construction; “” for diagonal-ply tyres; and
26、“R” for radial-ply tyres. NOTE 1 See also 4.4.3 for codes adopted for tyres suitable for speeds in excess of 240 km/h. Other codes will be established for new concepts (construction) of tyres. NOTE 2 The term “bias-belted construction” describes a pneumatic tyre structure of diagonal (bias ply) type
27、 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 65 and 90 as measured from the centreline of
28、 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
29、ould be incompatible. 4.3 Service description The characteristics shall be indicated as follows: Load index Speed symbol For load indices and speed symbols and their corresponding loads and speeds, see ISO 4223-1:2002, Tables A.1 and A.2. BS ISO 5751-1:2010ISO 5751-1:2010(E) ISO 2010 All rights rese
30、rved 3Table 1 Nominal rim diameter codes Dimensions in millimetresNominal rim diameter code Code Nominal rim diameterDr8 10 11 12 13 M/C 14 M/C 15 M/C 16 M/C 17 M/C 18 M/C 19 M/C 20 M/C 21 M/C 23 M/C 24 M/C 203 254 279 305 330 356 381 406 432 457 483 508 533 584 610 4.4 Other service characteristics
31、 4.4.1 In 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 shal
32、l be identified by means of the following speed categories, and not by the tyre construction code: “VB” or “ZB” for bias-belted construction; “VR” or “ZR” for radial construction. “ZB” and “ZR” should be used for the equipment of newly designed motorcycles with a maximum speed over 240 km/h. This id
33、entification shall be placed inside the tyre designation (see 4.2.1) instead of in the tyre construction code, as follows. a) For speed category “V”, “VB” or “VR” tyres suitable for speeds over 240 km/h, a service description shall be marked with the speed symbol “V” between parentheses, e.g. “120/6
34、0 VR 17 (55 V)”. b) For speed category “ZB” or “ZR” tyres suitable for speeds up to 270 km/h, a service description shall be marked with the speed symbol “W”, e.g. “120/60 ZR 17 55 W”. c) For speed category “ZB” or “ZR” tyres suitable for speeds over 270 km/h, the service description shall be marked
35、 with the speed symbol “W” between parentheses, e.g. “120/60 ZR 17 (55 W)”. BS ISO 5751-1:2010ISO 5751-1:2010(E) 4 ISO 2010 All rights reservedThe maximum speed approved by the tyre manufacturer may also be marked on the tyre, e.g. “V250” to identify a maximum speed of 250 km/h. 4.4.4 The symbol “MS
36、T” may be used to identify special-service tyres. 4.4.5 The symbol “DP” may be used to identify tread type C tyres. 4.5 Designation examples 4.5.1 A motorcycle tyre having: a) a size and construction of nominal section width, 120 mm, nominal aspect ratio, 80, diagonal construction, and nominal rim d
37、iameter 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 size and construction of nominal section width
38、, 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, a reference load-carrying capacity of 300 kg, corresponding to load index “66”, and a maximum speed of 270 km/h, correspondi
39、ng to speed symbol “W”, shall be marked: The same tyre approved for speeds in excess of 270 km/h shall be marked: BS ISO 5751-1:2010ISO 5751-1:2010(E) ISO 2010 All rights reserved 55.1 Calculation of design tyre dimensions 5.1.1 Theoretical rim width, RthThe theoretical rim width, Rth, shall be calc
40、ulated as follows: inal section width. s of existing concepts, K1shall be equal to: , 35, 30. pect ratios below 30. mng rim width nearest to Rth. See ISO 4249-3 for widths of , S e5 Tyre dimensions Rth= K1 SNwhere K1is the rim/section ratio; SNis the nomFor tyre0,6 for aspect ratios 100, 90, 80; 0,6
41、5 for aspect ratios 75; 0,7 for aspect ratios 70, 65, 60; 0,8 for aspect ratios 55, 50; 0,9 for aspect ratios 45, 40NOTE K1will be defined later for as5.1.2 Measuring rim width, RmThe measuring rim width, R , is width A of the existiexisting rims. 5.1.3 Design tyre section widthThe design tyre secti
42、on width, S, shall be the nominal section width, SN, transf rred from Rthto Rm, calculated as follows: ( )N2mthSS KR R=+ - rounded to the nearest whole number. For tyres of existing concepts, 5.1.4 Design tyre section height, H The design tyre section height, , shall be calculated as follows: 20,4K
43、= . HN100HSHS= rounded to the nearest whole number, BS ISO 5751-1:2010ISO 5751-1:2010(E) 6 ISO 2010 All rights reservedH/S is the nominal aspect ratio. 5.1.5 Design tyre overall diameter, Dooall be calculated as follows: wheris the nomifor the value of Drto be used. 5.1.6 Values ne values for the de
44、sign tyre dimensions for metric-series motorcycle tyres are given in Annex A. 5.2 re dimensions in service GenerThe calculations of 5.2.2 and 5.2.3, as well as Clause 9, are for use by vehicle manufacturers in designing tyre e design tyre section width; . ufacturing tolerances and growth due to serv
45、ice. Maximum overall diameter in service, Do,maxThe x Do,max, shall be calculated as follows: ,mrnal rim diameter; where SN is the nominal section width; The design tyre overall diameter, D , shor2D H=+ Dre D nal rim diameter; H is the design tyre section height. NOTE For those tyres using a nominal
46、 rim diameter code, see Table 1 GuideliCalculation of maximum overall ty5.2.1 al clearances. 5.2.2 Maximum overall width in service, WmaxThe maximum overall width in service, Wmax, shall be calculated as follows: Wmax= S a where S is tha is the appropriate coefficient (see Table 2)It includes protec
47、tive ribs, lettering, embellishments, tread overhang, man5.2.3 ma imum overall diameter in service,Do ax= Dr+ 2Hb where D is the nomiH is the design tyre section height; b is the appropriate coefficient (see Table 2). BS ISO 5751-1:2010ISO 5751-1:2010(E) ISO 2010 All rights reserved 7It inc ces and
48、growth due to service (for deformation due to centrifugal force, see Clause5.3 idth, SminThe mini equal to the product of the design tyre section width, S, and the appr iaminNOTE For tyres having a tread width wider than the section width, refer to the tread width for the minimum section Before mea
49、suring rim ready for tyre fitment, inflate to the recommended pres w to stand for a minimum of 24 h at normal room temperature, after which readjust the inflation pressueade of service are to be regarded as examples only. The e is at the discretion of the tyre manufacturer alone. ghway-service low-speed tyres; ted for highway-service high-speed tyres; ludes manufacturing toleran9). Calculation of minimum dimensions Section wmum section width, Smin, shall beopr
