ISO INTERNATIONAL STANDARD 9112 Secondedition 2008-02-15 Truck and bus tyres Methods of measuring tyre rolling circumference Loaded new tyres Pneumatiques pour vehicules utilitaires et autobus Méthodes de mesure de la circonference de roulementPneumatiques neufs en charge Reference number ISO 9112:2008(E) ISO @ ISO 2008 THS under Not for Resale ISO 9112:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimizedforprinting.Every care has been taken to ensure thatthe file is suitableforuse by isO member bodies. In the COPYRIGHTPROTECTEDDOCUMENT @ISO2008 All rights 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 either IsO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2008 - All rights reserved Not for Resale ISO 9112:2008(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 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. 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 9112 was prepared by Technical Committee ISO/TC 31, Tyres, rims and valves, Subcommittee SC 4, Truck and bus tyres and rims. This second edition cancels and replaces the first edition (isO 9112:1991), which has been technically revised ii ISO 9112:2008(E) Introduction The distance covered by a vehicle in a straight line in one wheel revolution is information that is increasingly used by the electronic systems in vehicles. One reason is that it makes it possible to indicate the instantaneous tyre deflected by the carried load and inflated to an adapted pressure level. A standardized measuring method is necessary because some parameters, such as tyre load and pressure, can cause the rolling circumference to change. This International Standard contributes to tyres being interchangeable for a given vehicle. Its application by tyre manufacturers allows confidence to be maintained in the information provided to the driver, especially concerning speed and distance travelled. @ISO2008-All rights reserved HSund itted without license from IHS Not for Resale ISO 9112:2008(E) INTERNATIONAL STANDARD Truck and bus tyres Methods of measuring tyre rolling circumference Loaded new tyres 1 Scope revolutionsperunitdistance(kilometre