ISO INTERNATIONAL STANDARD 13326 First edition 1998-12-15 Test methods for measuring tyre uniformity Methodes de mesure de I'uniformite du pneumatique Tso Reference number ISO 13326:1998(E) by IHS under lic itted without license from IHS Not for Resale ISO 13326:1998(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO committees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhas 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. Annex A of this International Standard is for information only. @ISO1998 Allrights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. InternationalOrganizationforStandardization Casepostale56·CH-1211Geneve20·Switzerland Internet [email protected] Printed in Switzerland Not for Resale INTERNATIONAL STANDARD @ISO ISO13326:1998(E) Test methods for measuring tyre uniformity 1 Scope This International Standard specifies test methods carried out under controlled conditions for verifying the uniformity of tyres for passenger cars, commercial vehicles and motorcycles. NOTE- Lack of uniformity around a tyre produces variations in forces applied by the tyre to the vehicle and this influence is repeated with each revolution of the tyre.Atthe present state of the art,however,itis impossible to manufacture perfectly uniform tyres. A rigid control of the complete manufacturing process can only minimise the unavoidable imperfections of materials,componentsandprocessesaffectinguniformity. as methods for measuring the following parameters: radial force variation; lateral force variation; ply steer; conicity. This International Standard does not include methods for measuring the static and the dynamic unbalance nor methods related to tyre-wheel assemblies. The test methods specified in this International Standard are not intended for the gradation of tyres or the definition of quality levels. 2 Normative references International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revisions and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. Members of IEC and IsO maintain registers of currently valid International Standards. IsO 4000-1:1995, Passenger car tyres and rims — Part 1: Tyres (metric series). IsO 4000-2:1994, Passenger car tyres and rims — Part 2: Rims. IsO 4209-1:1993, Truck and bus tyres and rims (metric series) — Part 1: Tyres. IsO 4209-2:1993, Truck and bus tyres and rims (metric series) Part 2: Rims. IsO 4223-1:1989, Definitions of some terms used in the tyre industry Part 1: Pneumatic tyres. Copyright International Organization for Standardization Not for Resale