BRITISH STANDARD AUTOMOBILE SERIES BS AU 50 1 6 3a 1995 ISO 6054 1 1994 Tyres and wheels — Part 1 Tyres — Section 6 Motorcycle tyres — Subsection 6 3a Specification for designations, dimensions and lo[.]
BRITISH STANDARD AUTOMOBILE SERIES Tyres and wheels — Part 1: Tyres — Section 6: Motorcycle tyres — Subsection 6.3a Specification for designations, dimensions and load ratings for code designated series (diameter codes to 12) tyres ICS 83 60 BS AU 50-1.6.3a:1995 ISO 6054-1: 1994 BS AU 50-1.6.3a:1995 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee AUE/4, Tyres and wheels for motor vehicles, upon which the following bodies were represented: Agricultural Engineers’ Association Automobile Association British Industrial Truck Association British Pressure Gauge Manufacturers’ Association British Rubber Manufacturers’ Association Confederation of Passenger Transport UK Department of Transport Freight Transport Association Institute of Road Transport Engineers (Inc) Motor Cycle Industry’s Association of Great Britain Ltd Motor Industry Research Association National Tyre Distributors’ Association Retread Manufacturers’ Association Road Haulage Association Ltd Society of Motor Manufacturers and Traders Ltd This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on December 995 © BSI 09-1 999 The following BSI references relate to the work on this standard: Committee reference AUE/4 Draft for comment 92/82582 DC ISBN 580 24917 Amendments issued since publication Amd No Date Comments BS AU 50-1.6.3a:1995 Contents Page Committees responsible Inside front cover National foreword ii Scope Normative reference Definitions Tyre designation Tyre dimensions Method of measurement of tyre dimensions Load capacities and inflation pressures Annex A (informative) Bibliography Table — Nominal rim diameter code Table — Section height Table — Tyre dimensions for nominal rim diameter codes 4, 5, and — Design and in- service Table — Tyre dimensions for nominal rim diameter codes 8, 9, and — Design and in-service Table — Maximum tyre load ratings and inflation pressures — Nominal rim diameter codes 4, 5, and Table — Maximum tyre load ratings and inflation pressures — Nominal rim diameter codes 8, 9, and Table — Percentage overload at other maximum speeds List of references © BSI 09-1 999 Inside back cover i BS AU 50-1.6.3a:1995 National foreword Motorcycle tyres and rims (code-designated series) — Diameter codes to 12 — Part 1: Tyres, This Subsection of this Part of BS AU 50 has been prepared by Technical Committee AUE/4 and is identical to ISO 6054-1 : 994 published by the International Organization for Standardization (ISO) BS AU 50-1 3a supersedes BS AU 50-1 3: 991 which is withdrawn Other Parts of the Standard are: — — — Part 2: Wheels and rims Part 3: Valves Part 4: Rim profiles and dimensions ; ; Cross-reference The Technical Committee has reviewed the provisions of ISO 4223-1 , to which normative reference is made in the text, and has decided that they are acceptable for use in conj unction with this standard 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 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages to 6, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii © BSI 09- 999 BS AU 50-1.6.3a:1995 Scope 4.2.1 Load index This part of ISO 6054 lays down the designation, The load index is a numerical code associated with dimensions, and load ratings for an inch-code- designated series of tyres for motorcycles, fitted on rims with a nominal diameter corresponding to the codes 4, 5, 6, 7, 8, 9, and ISO 6054-2 deals with the requirements for rims NOTE The parallel International Standards in the metric series are ISO 5751 - [4] , ISO 5751 - 2[5] and ISO 5751 - 3[6] Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO 6054 At the time of publication, the edition indicated was valid All standards are the maximum load a tyre can carry at the speed indicated by its speed symbol under service conditions specified by the tyre manufacturer 4.2.2 Speed symbol The speed symbol indicates the speed at which the tyre can carry a load corresponding to its load index under service conditions specified by the tyre manufacturer Tyre dimensions 5.1 Calculation of “design tyre” dimensions 5.1.1 Design tyre overall diameter, DO subj ect to revision, and parties to agreements based The design tyre overall diameter is the sum of the on this part of ISO 6054 are encouraged to nominal rim diameter, investigate the possibility of applying the most section height, recent edition of the standard indicated below Members of IEC and ISO maintain registers of currently valid International Standards Definitions of some terms used in the tyre industry — Part 1: Pneumatic tyres ISO 4223-1 : 989, DO = Dr H: + 2H see Table for the value of Dr to be used Table — Nominal rim diameter code Nominal rim diameter, Dr Code mm For the purposes of this part of ISO 6054, the 02 definitions given in ISO 4223-1 apply 27 Tyre designation 52 78 The designation of the tyre shall be shown on its 203 229 10 254 12 305 to be shown close to each other: 4.1 ); — service description (see 4.2 ) 4.1 Size dimension — size dimension (see The characteristics shall be indicated as follows: Nominal section width code 5.1.2 Design tyre section height, H The design tyre section height, nominal section width, rim diameter code SN, H, corresponds to the as shown in Table Table — Section height Nominal — plus twice the design tyre For tyres marked with a nominal rim diameter code, Definitions sidewall and shall include the following markings, Dr, Section height, H, for rim codes 4, 5, and 8, 9, 10 and 12 Nominal section width, SN, code mm mm 4.1.1 Nominal section width 50 — 67, The nominal section width shall be expressed by a 75 — 72, 00 code (see Table for code correlations) 4.1.2 Nominal rim diameter The nominal rim diameter shall be expressed by a code (see Table for code correlations) 4.2 Service description The characteristics shall be indicated as follows: Load index Speed symbol 25 74, — 50 86 00 99, 79, 85 91 , 06 50 112 1 9, 00 42 51 , 5.2 Calculation of “maximum overall tyre dimensions in service” These dimensions include protective ribs, lettering, embellishments, manufacturing tolerances, special tread configuration and growth due to service © BSI 09-1 999 BS AU 50-1.6.3a:1995 5.2.1 Maximum overall width in service, W 5.3 Design tyre and overall tyre dimensions The maximum overall width in service is equal to Table and Table give design tyre dimensions and the product of the design tyre section width overall tyre dimensions in service for the tyres of max the coefficient , 08: S and W = , 08S 5.2.2 Maximum overall diameter in service, D Method of measurement of tyre dimensions max O, max The maximum overall diameter in service is equal to D , plus twice the product of the design tyre section height, H, and the the nominal rim diameter, coefficient , : D O,max = D r + 2, 4.1 which the designation is as indicated in r Before measuring, tyres shall be mounted on the measuring rim, inflated to the recommended pressure, and allowed to stand for a minimum of 24 h at normal room temperature, after which the inflation pressure shall be readj usted to the original H value If rims of other widths are used, the values of design tyre section width, in service, W max , S, and maximum overall section shall be changed by 40 % of the difference in rim width Table — Tyre dimensions for nominal rim diameter codes 4, 5, and — Design and in-service Dimensions in millimetres Tyre size designation 3.00-5 3.00-7 3.50-4 3.50-5 3.05-6 3.50-7 4.00-5 4.00-7 4.50-6 6.00-6 Design tyre Measuring rim width Section width R S 53, m 80 In-service Maximum overall overall Overall diameter section width Maximum diameter D 276 327 W O 86 274 63, 92 299 324 291 342 99 31 341 367 346 63, 05 76 20 376 30 398 01 , 54 436 66 464 377 O , max 291 350 326 D max 113 397 © BSI 09- 999 BS AU 50-1.6.3a:1995 Table — Tyre dimensions for nominal rim diameter codes 8, 9, 10 and 12 — Design and in-service Dimensions in millimetres Tyre size designation 2.50-8 2.50-9 2.75-9 2.75-10 3.00-8 3.00-10 3.00-12 3.25-12 3.50-8 3.50-9 3.50-10 3.50-12 4.00-8 4.00-10 4.00-12 4.50-12 6.00-9 © BSI 09-1 999 Design tyre Measuring rim width Section width R S m 38 65 44, 71 53, 80 In-service Maximum overall overall Overall diameter section width Maximum diameter D 338 364 374 399 max 70 77 362 41 88 475 63, 92 437 95 99 466 389 41 429 492 430 455 506 41 05 378 404 488 63, 352 480 386 41 O , max 378 86 464 63, D W O 436 113 51 487 538 76 20 544 30 568 01 , 54 532 66 562 BS AU 50-1.6.3a:1995 Load capacities and inflation pressures Table — Maximum tyre load ratings and inflation pressures — Nominal rim diameter codes 8, 9, 10 and 12 Table and Table give the maximum load Tyre size designation capacities for the corresponding inflation pressures, with reference to a speed of 00 km/h For other Tyre size maximum speeds, apply the percentage overload given in Table Table — Maximum tyre load ratings and inflation pressures — Nominal rim diameter codes 4, 5, and Tyre size designation Tyre size 3.00-5 3.00-5 3.00-7 3.00-7 3.50-4 3.50-4 3.50-5 3.50-5 3.50-6 3.50-6 3.50-7 3.50-7 4.00-5 4.00-5 4.00-7 4.00-7 4.50-6 4.50-6 6.00-6 6.00-6 a Load index 10 22 18 30 16 28 20 32 24 Maximum load capacities for inflation pressure of 175 kPaa 250 kPaa kg 60 — 75 — 71 — 80 — 90 kg — 85 — 06 — 00 — 112 — 36 — 25 28 00 — 40 — 40 32 112 — 41 — 45 38 32 — 48 — 80 42 50 — 52 — 200 57 230 — 68 — 31 kPa = –2 bar 2.50-8 2.50-8 2.50-9 2.50-9 2.75-9 2.75-9 2.75-10 3.00-8 3.00-8 3.00-10 3.00-10 3.00-12 3.00-12 3.25-12 3.25-12 3.50-8 3.50-8 3.50-9 3.50-9 3.50-10 3.50-10 3.50-12 3.50-12 4.00-8 4.00-8 4.00-10 4.00-10 4.00-12 4.00-12 4.50-12 4.50-12 6.00-9 6.00-9 a Load index 16 28 20 30 24 Maximum load capacities for inflation pressure of 250 kPaa 175 kPaa kg 71 — 80 — 90 kg — 00 — 06 — 35 — 21 37 — 28 26 95 — 38 — 32 32 112 — 42 — 50 38 32 — 47 — 75 40 40 — 51 — 95 35 21 — 46 — 70 39 36 — 48 — 80 41 45 — 51 — 95 45 65 — 57 — 230 44 60 — 55 — 21 49 85 — 60 — 250 54 21 — 65 — 290 61 257 — 72 — 355 69 325 — 79 — 437 kPa = –2 bar © BSI 09- 999 BS AU 50-1.6.3a:1995 Table — Percentage overload at other maximum speeds Maximum speed Overload km/h % 50 30 70 16 80 10 90 00 110 –7 20 – 15 30 – 25 © BSI 09-1 999 BS AU 50-1.6.3a:1995 Annex A (informative) Bibliography Motorcycle tyres and rims (Code designated series) — Part 1: Tyres Motorcycle tyres and rims (Code-designated series) — Part 2: Tyre load ratings Motorcycle tyres and rims (code-designated series) — Part 3: Rims Motorcycle tyres and rims (metric series) — Part 1: Design guides Motorcycle tyres and rims (metric series)— Part 2: Tyre dimensions and load-carrying Motorcycle tyres and rims (metric series) — Part 3: Range of approved rim contours Motorcycle tyres and rims (Code-designated series) — Diameter codes to 12 — [1 ] ISO 4249-1 : 985, [2] ISO 4249-2: 990, [3] ISO 4249-3: —, 1) [4] ISO 5751 -1 : 994, capacities [5] ISO 5751 -2: 994, [6] ISO 5751 -3: 994, Part 2: Rims [7] ISO 6054-2: 990, 1) To be published (Revision of ISO 4249- 3: 990) © BSI 09- 999 BS AU 50-1.6.3a:1995 List of references See national foreword © BSI 09-1 999 BS AU 50-1.6.3a:1995 ISO 6054-1: 1994 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated 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