BRITISH STANDARD AUTOMOBILE SERIES BS AU 50 1 4 2b 1999 ISO 4251 2 1998 Tyres and wheels — Part 1 Tyres — Section 4 Agricultural tractor and machine tyres — Subsection 4 2b Specification for load rati[.]
BRITISH STANDARD AUTOMOBILE SERIES BS AU 0-1 -4.2b:1 999 ISO 425 -2: 998 Tyres and wheels — Part : Tyres — Section 4: Agricultural tractor and machine tyres — Subsection 4.2b: Specification for load ratings for ply rating marked series tyres IC S 65 60 ; 83 60 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 0-1 -4.2b:1 999 National foreword This British Standard reproduces verbatim ISO 4251 - 2: 998 and implements it as the UK national standard It supersedes BS AU 50- - 2a: 993 which is withdrawn The UK participation in its preparation was entrusted to Technical Committee AUE/4, Tyres and wheels for motor vehicles, which has the responsibility to: — aid enquirers to understand 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 A list of organizations represented on this committee can be obtained on request to its secretary 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 Electronic 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 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, page ii, pages to 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 This British Standard, having Amendments issued since publication been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on March 999 © BSI 07- 999 ISBN 80 30771 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy Amd No Date Comments BS AU 0-1 -4.2b:1 999 Contents Page National foreword Inside front cover Foreword ii 1 Scope Normative reference Definitions Tyres loads Annex A (informative) Tyres on nominal rim diameter codes and Annex B (informative) Bibliography 10 Table — Agricultural drive wheels — Tractor tyres (diagonal construction — normal section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Table — Agricultural drive wheels — Tractor tyres (diagonal construction — low section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Table — Agricultural drive wheels — Tractor tyres — Tyre loads at different speeds (load/speed relationship) Table — Agricultural drive wheels — Tractor tyres used as duals (diagonal construction — normal section height) — Load per tyre (L) for a maximum speed of 30 km/h and reference inflation pressures (IP) Table — Agricultural drive wheels — Tractor tyres used as duals (diagonal construction — low section height) — Load per tyre (L) for a maximum speed of 30 km/h and reference inflation pressures (IP) Table — Agricultural drive wheels — Tractor tyres for special cultivation work (diagonal and radial construction) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Table — Agricultural drive wheels — Tractor tyres for special cultivation work (diagonal and radial construction) — Tyre loads (L) for special cultivation work at a maximum speed of km/h and reference inflation pressures (IP) Table — Agricultural steering wheels — Tractor tyres (diagonal construction — normal section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Table — Agricultural steering wheels — Tractor tyres (diagonal construction — low section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Table — Agricultural steering wheels — Tractor tyres — Tyre loads at different speeds (load/speed relationship) Table 1 — Agricultural implement tyres (diagonal construction — normal section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Table — Agricultural implement tyres (diagonal construction — low section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Table A — Agricultural steering wheels — Tractor tyres (diagonal construction — low section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Table A — Agricultural implement tyres (diagonal construction — normal section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Table A — Agricultural implement tyres (diagonal construction — low section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) © BSI 07- 999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy i ii Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy blank Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 0-1 -4.2b:1 999 Foreword 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 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 closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization Draft International Standards adopted by the technical committees are circulated to the member bodies for voting Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote International Standard ISO 4251-2 was prepared by Technical Committee ISO/TC 31, Tyres, rims and valves, Subcommittee SC 5, Agricultural tyres and rims This fifth edition cancels and replaces the fourth edition (ISO 4251-2:1992), of which it constitutes a technical revision ISO 4251 consists of the following parts, under the general title Tyres (ply rating marked series) and rims for agricultural tractors and machines: — Part 1: Tyre designation and dimensions, and approved rim contours; — Part 2: Tyre load ratings; — Part 3: Rims; — Part 4: Tyre classification and nomenclature; — Part 5: Log skidder tyres Annex A and Annex B of this part of ISO 4251 are for information only Agricultural machinery, agricultural tractors, tyres, pneumatic tyres, loads (forces), load capacity, ratings Descriptors: ii Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy © BSI 07-1999 BS AU 0-1 -4.2b:1 999 Scope This part of ISO 4251 specifies load ratings for the ply rating marked series of tyres for agricultural tractors and machines Tyre designation and dimensions, and approved rim contours, rim dimensions, and tyre classification and nomenclature are given in ISO 4251-1, ISO 4251-3 and ISO 4251-4 respectively Service description (load index and speed symbol) marking for existing series (ply rating marked series) of agricultural tractor drive-wheel tyres of radial construction are given in ISO 8664 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO 4251 At the time of publication, the edition indicated was valid All standards are subject to revision, and parties to agreements based on this part of ISO 4251 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below Members of IEC and ISO maintain registers of currently valid International Standards ISO 4223-1:1989, Definitions of so m e term s used in the tyre industry — Part : Pneum atic tyres Definitions For the purposes of this part of ISO 4251, the definitions given in ISO 4223-1 and the following definitions apply On combine harvesters in cyclic loading application, except hillside combines, a load of up to 170 % of the basic tyre loads given in Table and Table is permitted for speeds up to 10 km/h with an inflation pressure increase of approximately 30 % (consult tyre manufacturers) This load increase shall include all possible field and user modifications that increase the vehicle mass The wheel and rim manufacturers shall be consulted concerning the strength of the wheels Tyre loads at different speeds (load/speed relationship) are given in Table for tyres of diagonal construction with normal section height and tyres of diagonal construction with low section height Load for tyres in dual application for a maximum speed of 30 km/h, and corresponding reference inflation pressures are given in a) Table for tyres of diagonal construction with normal section height; b) Table for tyres of diagonal construction with low section height Loads for tyres of diagonal and radial construction for special cultivation work and corresponding reference inflation pressures are given in a) Table for a maximum speed of 30 km/h; b) Table for cultivation work at a maximum speed of 10 km/h 4.2 Agricultural steering wheels — Tractor tyres Basic tyre loads for a maximum speed of 30 km/h, and corresponding reference inflation pressures are given in load/inflation pressure relationship a) Table for tyres of diagonal construction with loads as given in the tables which are maximum normal section height; values and are valid for the reference inflation pressures indicated b) Table for tyres of diagonal construction with low section height 3.2 cyclic loading application Tyre loads at different speeds (load/speed gradual increase of pay load to maximum allowable relationship) are given in Table 10 for tyres of diagonal construction with normal and low sections load with unloading before off-field transport 3.1 4.3 Agricultural implement tyres Basic tyre loads for a maximum speed of 30 km/h, tyre loads for other speeds and special applications corresponding reference inflation pressures are Basic tyre loads for a maximum speed of 30 km/h, and given in and corresponding reference inflation pressures are a) Table 11 for tyres of diagonal construction with given in normal section height; a) Table for tyres of diagonal construction with b) Table 12 for tyres of diagonal construction with normal section height; low section height b) Table for tyres of diagonal construction with low section height Tyres loads 4.1 Agricultural drive wheels — Tractor tyres © BSI 07-1999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 50-1 -4.2b:1 999 Table — Agricultural drive wheels — Tractor tyres (diagonal construction — normal section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size PR PR PR PR PR BTL IP BTL IP BTL IP BTL IP BTL IP BTL IP kg kPa kg kPa kg kPa kg kPa kg kPa kg kPa – 62 – 740 – 32 840 – 36 890 1 – 24 845 60 81 40 065 40 940 110 21 1 30 60 225 80 115 305 41 – 24 945 00 – 28 005 75 – 32 070 – 36 1 35 440 700 – 38 1 65 480 750 – 030 340 545 – 1 00 – 36 40 – 38 75 00 355 430 61 380 300 800 80 40 900 110 80 335 045 30 1 – 28 PR 51 70 60 605 645 855 30 790 00 91 50 660 91 21 990 – 51 760 – 560 82 – 61 – 30 665 940 90 – 38 870 80 460 5 – 38 765 – 72 040 2 30 305 40 40 880 060 055 80 80 120 32 – 780 05 – 840 75 – 30 900 2 45 455 30 70 380 – 34 01 380 605 – 38 30 52 760 – 990 2 65 645 – 30 120 – 34 2 50 – 38 380 41 110 565 50 30 30 00 990 80 80 375 71 65 575 – 42 865 340 765 – 34 92 – 38 090 85 30 – 42 – 850 – 30 02 – 34 225 – 32 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy 110 475 000 225 45 61 40 675 950 30 630 60 970 00 785 60 670 460 40 985 81 40 730 850 00 70 090 40 390 70 © BSI 07- 999 BS AU 50-1 -4.2b:1 999 Table — Agricultural drive wheels — Tractor tyres (diagonal construction — low section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size PR BTL kg 28 L – 26 30.5 L – 32 460 120 PR IP kPa BTL kg 785 745 140 140 PR IP kPa BTL kg 245 170 IP kPa Table — Agricultural drive wheels — Tractor tyres — Tyre loads at different speeds (load/speed relationship) Maximum speed 10c 20 25 30 km/h a Maximum tyre load b 140 120 107 100 a The values given for the maximum tyre loads also apply when drive wheel tractor tyres are fitted on the front axles (steering wheels) Table If national legislation permits speeds in excess of 30 km/h, for example up to 40 km/h, a tyre load of 90 % of the basic tyre load shall be permitted at a speed of 35 km/h, and a tyre load of 80 % of the basic tyre load shall be permitted at a speed of 40 km/h Tyres intended for higher speeds, for example multipurpose applications (MPT), will form the subject of a future International Standard c This applies to drive wheel tractor tyres fitted on front axles of front-end loaders used in intermittent service Tyre inflation pressures have to be increased by 30 kPa for operating at these overloads b Expressed as a percentage of the basic tyre loads given in Table and © BSI 07-1999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 50-1 -4.2b:1 999 Table — Agricultural drive wheels — Tractor tyres used as duals (diagonal construction — normal section height) — Load per tyre (L) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size PR PR PR PR PR PR L IP L IP L IP L IP L IP L IP kg kPa kg kPa kg kPa kg kPa kg kPa kg kPa – 550 – 650 – 32 740 – 36 785 1 – 24 745 1 – 28 790 60 71 40 82 40 935 975 21 995 980 080 80 1 50 – 24 830 055 – 28 885 120 – 32 940 – 36 000 65 495 – 38 02 300 540 110 1 90 300 580 80 330 70 41 – 905 1 80 360 970 60 450 – 36 090 – 38 1 20 42 21 40 45 – 00 80 1 75 92 30 110 60 630 30 575 00 680 890 460 680 950 750 – 330 550 – 375 600 – 41 – 30 465 705 92 – 38 645 92 65 5 – 38 555 – 52 40 40 650 81 81 80 80 795 865 040 – 565 62 – 30 670 975 60 2 90 850 91 30 30 960 – 30 50 030 70 095 00 400 – 34 775 095 – 38 875 220 430 – 750 995 430 62 – 30 865 25 475 800 – 34 980 – 38 095 110 2 55 40 630 80 970 390 785 45 – 42 52 940 31 – 34 570 – 38 72 890 30 – 42 – 51 670 – 34 840 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy 045 52 60 490 00 00 75 40 35 475 90 72 855 110 30 330 60 30 – 30 – 32 060 40 390 70 600 40 865 70 © BSI 07- 999 BS AU 50-1 -4.2b:1 999 Table — Agricultural drive wheels — Tractor tyres used as duals (diagonal construction — low section height) — Load per tyre (L) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size 28 L – 26 PR PR PR L IP L IP L IP kg kPa kg kPa kg kPa 045 20 30 L – 32 330 40 000 30 735 70 Table — Agricultural drive wheels — Tractor tyres for special cultivation work (diagonal and radial construction) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size Diagonal PR Radial – 36 865 – 40 935 – 36 R 36 970 – 42 R 42 055 – 44 R 44 080 – 36 R 36 1 30 – 44 R 44 55 – 48 R 48 32 PR BTL IP BTL IP kg kPa kg kPa 005 80 370 090 1 60 40 55 32 90 335 21 485 80 560 Table — Agricultural drive wheels — Tractor tyres for special cultivation work (diagonal and radial construction) — Tyre loads (L) for special cultivation work at a maximum speed of km/h and reference inflation pressures (IP) Tyre size Diagonal PR Radial – 36 115 – 40 1 80 PR L IP L IP kg kPa kg kPa 90 32 400 – 36 R 36 90 – 42 R 42 400 – 44 R 44 440 71 – 36 R 36 495 750 – 44 R 44 665 – 48 R 48 750 NO TE 390 535 60 30 665 945 350 300 045 Special cultivation work excludes road application except field to farm transit at speeds not exceeding km/h © BSI 07- 999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 50-1 -4.2b:1 999 Table — Agricultural steering wheels — Tractor tyres (diagonal construction — normal section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size 4.00 – 12 4.00 – 15 5.00 – 15 5.50 – 16 6.00 – 16 6.50 – 16 6.50 – 20 7.50 – 16 7.50 – 18 7.50 – 20 9.00 – 16 10.00 – 16 11.00 – 16 PR BTL kg 250 300 365 425 450 510 600 605 655 710 PR IP kPa BTL kg 340 280 250 230 230 IP kPa 465 525 560 615 725 745 810 875 900 965 140 200 PR 420 370 340 310 280 230 200 200 BTL kg PR IP kPa 675 735 865 870 945 020 080 190 320 BTL kg IP kPa 450 420 370 310 280 250 245 325 485 390 340 310 Table — Agricultural steering wheels — Tractor tyres (diagonal construction — low section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size Optional size marking 7.5 L – 15 9.5 L – 15 11 L – 15 PR BTL kg 8.25/85 – 15 585 9.5/85 – 15 11.5/75 – 15 PR IP kPa 200 BTL kg 720 770 865 PR IP kPa 280 230 200 BTL kg PR IP kPa 840 370 930 310 070 280 BTL kg PR IP kPa 190 340 BTL kg IP kPa 355 420 Table — Agricultural steering wheels — Tractor tyres — Tyre loads at different speeds (load/speed relationship) Maximum speed km/h Front-end loaders:10b 10 20 25 30 Maximum tyre load a 200 150 135 115 100 a Expressed as a percentage of the basic tyre loads given in Table and Table If national legislation permits speeds in excess of 30 km/h, for example up to 40 km/h, a tyre load of 90 % of the basic tyre load shall be permitted at a speed of 35 km/h, and a tyre load of 80 % of the basic tyre load shall be permitted at a speed of 40 km/h Tyres intended for higher speeds, for example multipurpose applications (MPT), will form the subject of a future International Standard b This applies to steering wheel tractor tyres of PR and more fitted on front axles of front-end loaders used in agricultural intermittent service for short distances (100 m maximum) Tyre inflation pressures have to be increased by 30 kPa for operating at these overloads Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy © BSI 07-1999 BS AU 50-1 -4.2b:1 999 Table 1 — Agricultural implement tyres (diagonal construction — normal section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size 4.00 – 4.00 – 12 4.00 – 15 5.00 – 15 5.50 – 16 5.90 – 15 6.00 – 16 6.40 – 15 6.50 – 16 7.00 – 12 7.50 – 16 7.50 – 18 7.50 – 20 7.50 – 24 9.00 – 16 10.00 – 15 11.25 – 24 11.25 – 28 PR BTL kg 155 210 PR IP kPa 150 150 BTL kg 225 300 355 430 500 480 570 555 640 555 700 720 775 830 PR IP kPa 275 275 275 225 200 200 200 200 200 175 150 150 150 160 BTL kg 685 670 775 680 890 950 980 PR IP kPa 275 275 275 250 225 225 225 BTL kg PR IP kPa 100 325 270 315 425 860 925 325 275 240 200 200 BTL kg IP kPa 240 400 445 325 245 260 NOTE For speeds up to a maximum of 10 km/h, loads may be increased by 20 % with an inflation pressure increase of up to 30 % (consult tyre and rim manufacturers) NOTE On agricultural trailers operated on improved surfaces at speeds up to a maximum of 30 km/h, loads may be increased by 20 % with a 30 % increase in inflation pressure where national standardization does not impose restrictions (consult tyre and rim manufacturers) © BSI 07-1999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 50-1 -4.2b:1 999 Table — Agricultural implement tyres (diagonal construction — low section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size PR designation BTL IP kg kPa PR BTL kg PR IP kPa BTL kg PR IP kPa BTL kg PR IP kPa 5.5/85 – 655 500 10.0/80 – 12 815 150 040 230 240 310 10.5/80 – 18 430 220 710 300 935 370 12.0/75 – 18 555 190 880 260 160 330 12.5/80 – 18 790 190 090 250 375 310 13.0/65 – 18 530 180 810 240 070 300 14.0/65 – 16 860 230 120 280 14.5/75 – 20 530 220 15.0/70 – 18 260 210 575 260 16.0/70 – 20 645 200 015 250 9.5 L – 15 895 190 100 280 11 L – 15 950 170 130 220 285 280 11 L – 16 995 170 175 220 340 280 PR BTL IP BTL kg kPa kg IP kPa PR BTL IP kg kPa 625 370 910 430 130 490 210 360 555 430 750 490 580 400 890 310 115 360 355 300 670 350 970 400 NOTE For speeds up to a maximum of 10 km/h, loads may be increased by 20 % with an inflation pressure increase of up to 30 % (consult tyre and rim manufacturers) NOTE On agricultural trailers operated on improved surfaces at speeds up to a maximum of 30 km/h, loads may be increased by 20 % with a 30 % increase in inflation pressure where national standardization does not impose restrictions (consult tyre and rim manufacturers) Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy © BSI 07-1999 BS AU 50-1 -4.2b:1 999 Annex A (informative) Tyres on nominal rim diameter codes 5.3 and 6.1 The technical data of the former standardized tyres with nominal rim diameter codes 15.3 and 16.1 are given in Table A.1, Table A.2 and Table A.3 Table A.1 — Agricultural steering wheels — Tractor tyres (diagonal construction — low section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size Optional size PR marking 14 L – 16.1 14.0/80 – 16.1 BTL kg PR IP kPa BTL kg PR IP kPa 295 170 BTL kg PR IP kPa BTL kg 530 230 PR IP kPa 745 280 BTL kg IP kPa 940 340 Table A.2 — Agricultural implement tyres (diagonal construction — normal section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size PR BTL kg 13.50 – 16.1 PR IP kPa BTL kg PR IP kPa BTL kg 600 PR IP kPa 140 BTL kg 855 PR IP kPa 180 BTL kg 195 IP kPa 240 NOTE For speeds up to a maximum of 10 km/h, loads may be increased by 20 % with an inflation pressure increase of up to 30 % (consult tyre and rim manufacturers) NOTE On agricultural trailers operated on improved surfaces at speeds up to a maximum of 30 km/h, loads may be increased by 20 % with a 30 % increase in inflation pressure where national standardization does not impose restrictions (consult tyre and rim manufacturers) Table A.3 — Agricultural implement tyres (diagonal construction — low section height) — Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size designation 10.0/75 – 15.3 11.5/80 – 15.3 14 L – 16.1 PR BTL kg IP kPa PR BTL kg PR IP kPa BTL kg PR IP kPa BTL kg IP kPa PR BTL kg PR PR IP BTL IP BTL IP kPa kg kPa kg kPa 880 150 120 230 330 310 525 390 410 200 675 270 930 340 145 410 835 220 090 280 NOTE For speeds up to a maximum of 10 km/h, loads may be increased by 20 % with an inflation pressure increase of up to 30 % (consult tyre and rim manufacturers) NOTE On agricultural trailers operated on improved surfaces at speeds up to a maximum of 30 km/h, loads may be increased by 20 % with a 30 % increase in inflation pressure where national standardization does not impose restrictions (consult tyre and rim manufacturers) © BSI 07-1999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 50-1 -4.2b:1 999 Annex B (informative) Bibliography [1 ] IS O 42 - : 98, Tyres (ply rating marked series) and rims for agricultural tractors and machines — Part : Tyre designation and dimensions, and approved rim contours [2 ] IS O 42 - : 94, Part 3: Rims Tyres (ply rating marked series) and rims for agricultural tractors and machines — Tyres (ply rating marked series) and rims for agricultural tractors and machines — Part 4: Tyre classification and nomenclature [3 ] IS O 42 - 4: 92 , [4] IS O 8664: 99 , marked tyres Agricultural tractor drive-wheel tyres — Service description (load index — speed symbol) 10 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy © BS I 07 - 99 blank Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 0-1 -4.2b:1 999 ISO 4251 -2: BSI — British Standards Institution 998 BS I is the indep endent national b ody res p ons ib le for p rep aring Britis h S tandards It p res ents the UK view on s tandards in E urop e and at the international level It is incorp orated b y Royal C harter Revisions Britis h S tandards are up dated b y amendment or revis ion Us ers of Britis h S tandards should make s ure that they p oss es s the latest amendments or editions It is the constant aim of BS I to imp rove the quality of our p roducts and services We would b e grateful if anyone finding an inaccuracy or amb iguity while us ing this Britis h S tandard would inform the S ecretary of the technical committee res p ons ib le, the identity of which can b e found on the inside front cover Tel: 02 89 96 90 00 Fax: 02 89 96 40 BS I offers memb ers an individual up dating s ervice called PLUS which ens ures that s ub s crib ers automatically receive the lates t editions of s tandards Buying standards O rders for all BS I, international and foreign s tandards p ub lications s hould b e addres s ed to C us tomer S ervices Tel: 899 00 Fax: 899 7001 In res p ons e to orders for international standards , it is BS I p olicy to sup p ly the BS I imp lementation of thos e that have b een p ub lis hed as Britis h S tandards, unless otherwis e requested Information on standards BS I p rovides a wide range of information on national, E urop ean and international standards through its Lib rary and its Technical H elp to E xp orters S ervice Various BS I electronic information s ervices are also availab le which give details on all its p roducts and s ervices C ontact the Information C entre Tel: 02 89 96 71 1 Fax: 02 89 96 048 S ub s crib ing memb ers of BS I are kep t up to date with s tandards develop ments and receive sub s tantial discounts on the p urchase p rice of s tandards For details of thes e and other b enefits contact Memb ership Adminis tration Tel: 02 89 96 70 02 Fax: 02 89 96 00 Copyright C op yright s ub s is ts in all BS I p ub lications BS I als o holds the cop yright, in the UK, of the p ub lications of the international s tandardization b odies E xcep t as p ermitted under the C op yright, D es igns and Patents Act 988 no extract may b e rep roduced, s tored in a retrieval s ystem or transmitted in any form or b y any means – electronic, p hotocop ying, recording or otherwis e – without p rior written p ermis s ion from BS I This does not p reclude the free us e, in the cours e of imp lementing the standard, of necess ary details such as s ymb ols, and size, typ e or grade designations If thes e details are to b e used for any other p urp os e than imp lementation then the p rior written p ermiss ion of BS I must b e ob tained If p ermis sion is granted, the terms may include royalty p ayments or a licensing agreement D etails and advice can b e ob tained from the C op yright Manager BS I 89 C his wick H igh Road London W4 4AL Reprodu ced by I H S u n d er l i cen se wi th BSI - 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