ISO/DIS 5383

Agricultural tyres for lawn and garden tractors -- 3-part code designated tyres

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DRAFT INTERNATIONAL STANDARD
ISO/DIS 5383
ISO/TC 31/SC 5 Secretariat: UNI
Voting begins on: Voting terminates on:
2021-04-05 2021-06-28
Agricultural tyres for lawn and garden tractors — 3-part
code designated tyres
ICS: 83.160.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 5383:2021(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2021
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ISO/DIS 5383:2021(E)
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© ISO 2021

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ii © ISO 2021 – All rights reserved
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ISO/DIS 5383:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Marking .......................................................................................................................................................................................................................... 2

4.1 Tyre size designation ......................................................................................................................................................................... 2

4.1.1 Nominal Overall Diameter Code ......................................................................................................................... 2

4.1.2 Nominal Section Width Code ................................................................................................................................ 2

4.1.3 Tyre construction code ............................................................................................................................................... 2

4.1.4 Nominal rim diameter code ................................................................................................................................... 2

4.1.5 Other markings ................................................................................................................................................................. 3

4.2 Load rating .................................................................................................................................................................................................. 3

4.3 Service description .............................................................................................................................................................................. 3

4.3.1 Load index ............................................................................................................................................................................. 3

4.3.2 Speed symbol ...................................................................................................................................................................... 3

4.3.3 Type of service ................................................................................................................................................................... 3

4.4 Additional information .................................................................................................................................................................... 4

4.4.1 General...................................................................................................................................................................................... 4

4.4.2 Maximum pressure for tyre bead seating .................................................................................................. 4

5 Tyre dimensions ................................................................................................................................................................................................... 4

5.1 Design new tyre dimensions ....................................................................................................................................................... 4

5.1.1 Design rim width ............................................................................................................................................................. 5

5.1.2 Design new tyre section width (S) ................................................................................................................... 5

5.1.3 Design new tyre overall diameter (Do) ........................................................................................................ 5

5.1.4 Design section height ................................................................................................................................................... 5

5.2 Maximum overall tyre dimensions in service .............................................................................................................. 5

5.2.1 Maximum overall width in service, W ....................................................................................................

max 5

5.2.2 Maximum overall diameter in service, D .........................................................................................

O, max 6

5.3 Minimum new tyre overall diameter ................................................................................................................................... 6

6 Tyre dimensional data .................................................................................................................................................................................... 6

7 Method of measurement of tyre dimensions .......................................................................................................................... 6

8 Tyre and rim coordination ......................................................................................................................................................................... 7

8.1 Approved rim width codes ........................................................................................................................................................... 7

8.2 Approved rim contours.................................................................................................................................................................... 7

9 Tyre parameters for vehicle speed reference ........................................................................................................................ 7

10 Tyre load ratings................................................................................................................................................................................................... 7

10.1 Basic tyre load ......................................................................................................................................................................................... 7

10.1.1 Load and inflation pressure relationship ................................................................................................... 7

10.2 Tyre applications at service speeds other than the reference speed ....................................................... 8

Annex A (normative) Tyre dimensions .............................................................................................................................................................. 9

Annex B (normative) Approved rim contours .........................................................................................................................................11

Annex C (normative) Basic Tyre loads (BTL) at reference inflation pressure .......................................................12

Annex D (informative) Speed radius index (SRI) ..................................................................................................................................15

Bibliography .............................................................................................................................................................................................................................16

© ISO 2021 – All rights reserved iii
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ISO/DIS 5383:2021(E)
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.

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.

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 patent rights.

ISO 5383 was prepared by Technical Committee ISO/TC 31, Tyres, rims and valves, Subcommittee SC 5,

Agricultural tyres and rims.
iv © ISO 2021 – All rights reserved
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DRAFT INTERNATIONAL STANDARD ISO/DIS 5383:2021(E)
Agricultural tyres for lawn and garden tractors — 3-part
code designated tyres
1 Scope
A paragraph.

This document establishes the designation, the dimensions, the approved rim contours and the load

ratings for 3-part code designated tyres in diagonal or radial construction for lawn, garden tractors

and agricultural machines, with a nominal rim diameter code 18 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, 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 tyres

ISO 18804, Rims for agricultural, forestry and construction machines

ISO 18805, Tyre classification — Agricultural, forestry and construction machines

ISO 29802, All-terrain (AT) tyres and rims — Symbol marked pneumatic tyres on 5 degree tapered rims —

Designation, dimension, marking and load ratings
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4223-1 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
3.1
drive wheel tyre
tyre designed primarily for the equipment of driven axles
3.1.1
high and sustained torque

condition that occurs when high continuous tractive effort is applied to the drawbar or hitch

3.1.2
low torque

condition that occurs when the primary torque involved is only that applied to propel the vehicle

3.2
free rolling tyre
tyre designed for the equipment of non-driven (trailed) axles
3.3
mixed applications tyre
tyre designed to be fitted to either driven and non-driven (trailed) axles
© ISO 2021 – All rights reserved 1
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ISO/DIS 5383:2021(E)
3.4
tractor tyre

tyre primarily designed to be fitted to driven axles of agricultural tractors that are destined to high

and sustained torque applications

Note 1 to entry: Note to entry: The tyre tread pattern consists of lugs (cleats) for optimum field traction

3.5
implement tyre

tyre primarily designed for agricultural machines (i.e. interchangeable towed equipment, agricultural

trailers, motor cultivators or lawn and garden tractors)
3.6
Ply Rating (PR)

indication of tyre strength and does not correspond to the actual number of plies in the tyre

3.7
NHS (Not for Highway Service)

tyre primarily designed for use outside of public roads, but suitable for temporary/incidental use on

public roads
4 Marking

The marking consists of the tyre size designation, the load rating, and any additional information. See

4.1 to 4.4. for details.
4.1 Tyre size designation

The marking for the identification of tyres consists of the nominal overall diameter code, the symbol

“X”, the nominal section width code, the construction code and the nominal rim diameter code.

Nominal Nominal
overall section Tyre Nominal
diameter width construction rim diameter
code code code code
Example 23 x 10.00 - 10
4.1.1 Nominal Overall Diameter Code

The nominal overall diameter shall be indicated by means of a code with steps of 1 unit starting from 10.

4.1.2 Nominal Section Width Code

The nominal section width shall be indicated by means of a code with steps of 0,50 unit starting from 4.00.

4.1.3 Tyre construction code
The tyre construction code shall be as follows:
“-” (a dash) or “D” for diagonal ply construction
R for radial ply construction
4.1.4 Nominal rim diameter code

The nominal rim diameter code shall be as specified in Table A.3 of ISO 4223-1 and in ISO 18804.

2 © ISO 2021 – All rights reserved
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ISO/DIS 5383:2021(E)
4.1.5 Other markings

For conformity to some regional regulations, in case of tyres classified in the category of use

“implement” the inscription “IMPLEMENT” or the suffix “IMP” shall be marked on the tyre sidewall.

NOTE “implement” tyres may also be fitted to the drive wheels of agricultural tractors with low torque

applications.
4.2 Load rating

The marking of load rating, except for radial tyres for which it is optional, comprises the ply rating (PR).

EXAMPLE
16x6.50-8 4PR
16x6.50-8 IMP 4PR
4.3 Service description

The marking of the service description consist of a load index and a speed symbol. If not required by

regional regulations it is an optional marking.
4.3.1 Load index

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 service conditions specified by the tyre manufacturer.

The correlation between load indices and tyre load carrying capacities shall be as given in Table A.1 of

ISO 4223-1.
4.3.2 Speed symbol

The speed category symbol is a symbol indicating the speed at which the tyre can carry the load

corresponding to its load index under service conditions specified by the tyre manufacturer.

The following speed symbols apply.
Speed
Speed symbol
km/h
A4 20
A6 30
A8 40
B 50
4.3.3 Type of service

When, as required by regional regulations in case of tyres classified in the category of use “implement”,

the basic tyre load is referred to the type of service (Free rolling tyre or Drive wheel tyre) they were

designed for, the relevant service description shall be supplemented by the following symbol.

for Drive wheel tyre EXAMPLE 16x6.50R8 4PR 64A6
for Free rolling tyre EXAMPLE 16x6.50R8 4PR 64A6
© ISO 2021 – All rights reserved 3
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