ISO 8664:1992

Agricultural tractor drive-wheel tyres — Service description (load index — speed symbol) marked tyres

ISO 8664:1992

Name:ISO 8664:1992   Standard name:Agricultural tractor drive-wheel tyres — Service description (load index — speed symbol) marked tyres
Standard number:ISO 8664:1992   language:English language
Release Date:16-Dec-1992   technical committee:ISO/TC 31/SC 5 - Agricultural tyres and rims
Drafting committee:ISO/TC 31/SC 5 - Agricultural tyres and rims   ICS number:83.160.30 - Tyres for agricultural machinery
INTERNATIONAL
ISO
STANDARD
8664
First edition
1992-12-15
Agricultural tractor drive-wheel tyres -
Service description (load index - Speed
Symbol) marked tyres
Pneumatiques pour roues motrkes de tracteurs agrkoles -
Pneumatiques marquks de leurs caract&istiques d’utilisation (indice de
Charge et code de vitesse)
Weference wmber
ISO 86643 992jE)

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ISO 8664:1992(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. Esch 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 8664 was prepared by Technical Committee
ISO/TC 31, Tyres, rims and vahes, Sub-Committee SC 5, Agrkultural tyres
and rims.
An nex A for ms an in tegral part of this International Standard. Annex B is
for informati on only.
0 ISO 1992
All rights reserved. No part of this publication may be reproduced or utilized in any ferm or
by any means, electronie or mechanical, including photocopying and microfilm, without per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 211 Geneve 20 l Switzerland
Printed in Switzerland
ii

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ISO 8664:1992[El)
INTERNATIONAL STANDARD
Agricultural tractor drive-wheel tyres - Service
description (load index - Speed Symbol) marked tyres
ISO 4223-1:1989, Definitions of some terms used in
1 Scope
the tyre industry - Part 1: Pneumatic tyres.
This International Standard specifies the marking, di-
ISO 4251-1 :1992, Tyres (ply rating marked series) and
mensions, load ratings and reference Speeds for ex-
rims for agricultural tractors and machines - Part 7:
isting series of agricultural tractor drive-wheel tyres
Tyre designa tion and dimensions.
with Service description (load index and Speed sym-
bol) .
ISO 4251-3:1985, Tyres and rims (existing series) for
agricultural tractors and machines - Part 3: ßims.
lt applies to tyres of radial construction in the Speed
categories 30 km/h (Speed Symbol A6) and 40 km/h
(Speed Symbol A8).
3 Definitions
For the purposes of this International Standard, the
definitions given in ISO 4223-1 and the following de-
finition apply.
3.1 cyclic loading application: Gradual increase of
2 Normative references
payload to maximum allowable load wit h unloading
before off-field transport.
The following Standards contain provisions which,
through reference in this text, constitute provisions
of this International Standard. At the time of publica-
tion, the editions indicated were valid. All Standards
4 Tyre marking
are subject to revision, and Parties to agreements
based on this International Standard are encouraged
PO investigate the possibility of applying the most re- The tyre marking shall consist of the designation of
the dimensional and constructional characteristics
cent editions of the Standards indicated below.
(tyre size) and the Service condition characteristics
Members of IEC and ISO maintain registers of cur-
(load index and Speed Symbol).
rently valid International Standards.
1

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ISO 8664:1992(E)
EXAMPLE
Load Index (144 = 2 800 kg per tyre)
Speed Symbol (A8 = 40 km/h reference Speed)
9
18.4 R 34 144 A8
Service condition characteristics
q TyresizeP?=radiaLl
7 Tyre applications other than at
5 Tyre dimensions
reference Speed
Standard sizes, measurement rims, tyre design di-
mensions and maximum tyre dimensions in Service
For applications without high and sustained torques,
are given in table 1.
including road transport, the load/speed relationship
is given in table 2.
The tyre manufacturer concerned shall be consulted
6 Tyre load ratings
for the actual pressure to be used when applying the
load/speed relationship given in table 2.
Load indices and tyre loads for the Speed indicated
The rim/wheel manufacturer shall be consulted for
by the Speed Symbol (reference Speed) and reference
confirmation of the strength of the rim/wheel for the
inflation pressures for the tyres of table 1 are given in
intended Service.
annexes A and B.
Table 1 - Standard sizes, measurement rims, and dimensions
Dimensions in millimetres
Design tyre In Service
Measurement ’
Maximum
Tyre size
Maximum
rim width codel)
Section width Overall diameter Overall
Overall width
diameter*)
a) Normal section height tyres
1 015
995
11.2 R 20
1 095 1 115
11.2 R 24
1 200 307 1 220
R 28 10 284
11.2
1400 1 420
11.2 R 36
1455 1 475
11.2 R 38
1 045 1 070
12.4 R 20
1 145 1 170
12.4 R 24
1 250 1 275
12.4 R 28
1 375
1 350 340
12.4 R 32 11 315
1 475
1 450
12.4 R 36
1 525
1 500
12.4 R 38
1 215
1 190
13.6 R 24
1 320
1 295
13.6 R 28
1 525
1 500 373
13.6 R 36 12 345
1 575
1 550
R 38
13.6
I
1 275
1 245
14.9 R 24
1 325
1 295
14.9 R 26
1 380
1 350 408
13 378
14.9 R 28
1 425
1400
14.9 R 30
1 600 1 630
14.9 R 38

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ISO 8664:1992(E]
Design tyre In Service
Measurement ’
Maximum
Tyre size
Maximum
rim width codel)
Section width Overall diameter Overall
Overall width
diameter*)
1320 1 350
R 24
16.9
...

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