GB/T 31887.2-2025Cycles - Lighting and retro-reflective devices - Part 2: Retro-reflective devices (English PDF)

1 Scope

This document specifies the optical, chromatic, physical, and marking requirements for cycle retro-reflective devices. The corresponding test methods are described.

This document applies to cycles used on public roads, particularly retro-reflective devices for two-wheeled cycles conforming to GB 3565.2 and GB 14746.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

CIE 15, Colorimetry

CIE 1931, Color Space

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1 retro-reflective device reflector

A readily available component consisting of one or more reflective optical units.

3.2 wide angle reflector

A device that can reflect back light rays with a horizontal incident angle of not less than

50° from both sides of the reference axis.

3.3 conventional reflector

A device that can reflect back light rays with a horizontal incident angle of not less than

20° from both sides of the reference axis.

3.4 retro-reflective tyre

Available tyres with molded annular retro-reflective strips on both sidewalls.

3.5 pedal reflector

Reflector mounted on the pedals.

4 General

5 Optical requirements

6 Chromatic requirements

When testing according to the method described in Chapter 9, the color of the reflected light shall be within the range defined by the CIE chromaticity coordinates given in

Table 8.

NOTE: For ease of reference, these areas have been marked in Figure 2.

7 Physical requirements