ISO 6742-2:2015

INTERNATIONAL ISO
STANDARD 6742-2
Third edition
2015-05-15
Cycles — Lighting and retro-
reflective devices —
Part 2:
Retro-reflective devices
Cycles — Dispositifs d’éclairage et dispositifs rétroréfléchissants —
Partie 2: Dispositifs rétroréfléchissants
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General . 2
4.1 Symbols and units used . 2
4.2 Chronological order of tests (only for reflectors) . 3
5 Photometrical requirements . 4
5.1 Reflectors . 4
5.2 Retro-reflective tyres . 6
5.3 Retro-reflective spokes or spoke cases . 7
6 Colorimetric requirements. 8
7 Physical requirements . 9
7.1 Reflectors . 9
7.1.1 Construction . 9
7.1.2 Test methods . 9
7.2 Retro-reflective tyres .10
7.2.1 Form and location .10
7.2.2 Test methods .10
7.3 Retro-reflective spokes or spoke cases .12
7.3.1 Construction .12
7.3.2 Test methods .12
8 Photometric test .13
8.1 General .13
8.1.1 Instrumentation arrangement .13
8.1.2 Source of illumination .14
8.1.3 Receiver .14
8.1.4 Observation distance.14
8.1.5 Illuminance at the reflector .14
8.2 Reflectors .14
8.2.1 Principle .14
8.2.2 Reflector mount (or support) .14
8.2.3 Test area of reflector .15
8.2.4 Orientation of reflector .15
8.3 Retro-reflective tyres .15
8.3.1 Principle .15
8.3.2 Test method .15
8.4 Retro-reflective spokes or spoke cases .15
8.4.1 Testing assemblies for retro-reflective spokes and spoke cases .15
8.4.2 Test method .16
9 Colorimetric test .16
9.1 Instrumental measurements .16
9.2 Visual comparison .17
9.3 Use of methods .17
10 Marking .17
Bibliography .18
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT), see the following URL: Foreword — Supplementary information.
The committee responsible for this document is ISO/TC 149, Cycles, SC 1, Cycles and major sub-assemblies.
This third edition cancels and replaces the second edition (ISO 6742-2:1985), which has been
technically revised.
ISO 6742 consists of the following parts, under the general title Cycles — Lighting and retro-reflective devices:
— Part 1: Lighting and light signalling devices
— Part 2: Retro-reflective devices
— Part 3: Installation and use of lighting and retro-reflective devices
— Part 4: Lighting systems powered by the cycle’s movement
— Part 5: Lighting systems not powered by the cycle’s movement
iv © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 6742-2:2015(E)
Cycles — Lighting and retro-reflective devices —
Part 2:
Retro-reflective devices
1 Scope
This part of ISO 6742 is applicable to retro-reflective devices used on cycles intended to be used on
public roads and, especially, bicycles complying with ISO 4210 and ISO 8098.
This part of ISO 6742 specifies photometric and physical requirements of retro-reflective devices.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
CIE 15, Colorimetry: official recommendations of the International Commission on Illumination
CIE 1931, XYZ colour space of the International Commission on Illumination
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
retro-reflective device; reflector
assembly ready for use and comprising one or more retro-reflecting optical units
3.2
wide angle reflector
device providing retro-reflection through horizontal entrance angles of not less than 50° on either side
of the reference axis
3.3
conventional reflector
device providing retro-reflection through entrance angles of not less than 20° on either side of the
reference axis
3.4
high values reflector
red retro-reflective device with high values of reflection e.g. dedicated to be mounted on luggage carrier
3.5
retro-reflective spoke
spoke with retro-reflective surface
3.6
retro-reflective spoke case
device, e.g. cylinder, with retro-reflective surface with or without a gap, providing a secured
mounting on a spoke
3.7
retro-reflective tyre
tyre ready for use and comprising retro-reflecting annuli moulded on to each sidewall of the tyre
4 General
4.1 Symbols and units used
Symbols are shown in Figure 1. Their meaning and units used are given in Table 1.
Figure 1 — Symbols
NOTE The following symbols are in accordance with Regulation No.3 of the UN/ECE concerning retro-
reflective device
...