ISO 6692:1981 サイクル—サイクルコンポーネントのマーキング | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (ISO member bodies). The work of developing International Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been set up 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.

Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council.

International Standard ISO 6692 was developed by Technical Committee ISO/TC 149, Cycles, and was circulated to the member bodies in December 1979.

It has been approved by the member bodies of the following countries:

No member body expressed disapproval of the document.

0 Introduction

Certain cycle components are made according to two different systems, namely:

• the metric system,
• the British Standard Cycle (BSC) thread system.This is notably the case:
• with free wheels (screw thread for assembly into the hub),
• with hubs (threads on the axles and for the free wheel),
• with the cups on bottom brackets (assembly threads on the bottom bracket housing),
• with bottom bracket housings (threads for assembling the cups),
• with bottom bracket axles (diameter of the shaft holding the cranks),
• with cranks (diameter of the hole for the axle — threads for the pedals),
• with pedals (thread for fixing to the cranks),
• with handlebar stem (in respect of the diameter), etc.

On all these parts, the metric and BSC systems are not interchangeable and the dangers of incompatibility exist in many cases.

No international convention exists for establishing a system of marking allowing one to differentiate efficiently between components of the two systems. This absence of a convention has not had any unfortunate consequences up to the present time since in each country only one system was used.

1 Scope and field of application

This International Standard specifies the marking system recommended to the manufacturer so as to reduce risks of incompatibility between components of bicycles produced according to new ISO Standards and traditional components.

This problem of selection of the appropriate component will make itself felt above all at the level of the repair of bicycles and the distribution of spare parts; it will be necessary for this distinguishing mark to be:

• universal , i.e. understandable by users and repairers in all countries,
• standardized , i.e. the same sort of mark for all cycle components,
• practical , i.e. easy to apply and visible on all the components concerned.

2 Reference