Cycles — Safety requirements for bicycles — Part 5: Steering test methods

This document specifies the steering test methods for ISO 4210‑2.

Cycles — Exigences de sécurité pour les bicyclettes — Partie 5: Méthodes d'essai de la direction

General Information

Status
Published
Publication Date
10-Jan-2023
Current Stage
6060 - International Standard published
Due Date
12-Sep-2022
Completion Date
11-Jan-2023
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ISO 4210-5:2023 - Cycles — Safety requirements for bicycles — Part 5: Steering test methods Released:11. 01. 2023
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INTERNATIONAL ISO
STANDARD 4210-5
Second edition
2023-01
Cycles — Safety requirements for
bicycles —
Part 5:
Steering test methods
Cycles — Exigences de sécurité pour les bicyclettes —
Partie 5: Méthodes d'essai de la direction
Reference number
ISO 4210-5:2023(E)
© ISO 2023
---------------------- Page: 1 ----------------------
ISO 4210-5:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2023 – All rights reserved
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ISO 4210-5:2023(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Test methods ............................................................................................................................................................................................................ 1

4.1 Handlebar grips and plugs ........................................................................................................................................................... 1

4.1.1 Freezing test ........................................................................................................................................................................... 1

4.1.2 Hot water test ........................................................................................................................................................................ 2

4.2 Handlebar stem — Lateral bending test ......................................................................................................................... 2

4.3 Handlebar and stem assembly — Lateral bending test ..................................................................................... 3

4.4 Handlebar stem — Forward bending test ..................................................................................................................... 5

4.4.1 Test method for stage 1 ................................................................................................................................................ 5

4.4.2 Test method for stage 2 ................................................................................................................................................ 7

4.5 Handlebar to handlebar stem — Torsional security test ................................................................................. 7

4.6 Handlebar stem to fork steerer — Torsional security test ............................................................................. 7

4.7 Bar end to handlebar — Torsional security test ...................................................................................................... 8

4.8 Aerodynamic extensions to handlebar — Torsional security test ........................................................... 9

4.9 Handlebar and stem assembly — Fatigue test ........................................................................................................ 10

4.9.1 Test method except drop handlebar .............................................................................................................. 10

4.9.2 Test method for drop handlebar .......................................................................................................................12

iii
© ISO 2023 – All rights reserved
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ISO 4210-5:2023(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 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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any 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 of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 149, Cycles, Subcommittee SC 1, Cycles

and major sub-assemblies, in collaboration with the European Committee for Standardization (CEN)

Technical Committee CEN/TC 333, Cycles, in accordance with the Agreement on technical cooperation

between ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 4210-5:2014), which has been technically

revised.
The main changes are as follows:
— improvement of 4.1.1;
— improvement of 4.3;
— improvement of 4.4;
— increase in test torque for 4.6;
— improvement of 4.9.
A list of all parts in the ISO 4210 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2023 – All rights reserved
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ISO 4210-5:2023(E)
Introduction

This document has been developed in response to demand throughout the world, and the aim has been

to ensure that bicycles manufactured in conformity with this document will be as safe as is practically

possible. The tests have been designed to ensure the strength and durability of individual parts as well

as of the bicycle as a whole, demanding high quality throughout and consideration of safety aspects

from the design stage onwards.

The scope has been limited to safety considerations, and has specifically avoided standardization of

components.
If the bicycle should be used on public roads, national regulations apply.
© ISO 2023 – All rights reserved
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 4210-5:2023(E)
Cycles — Safety requirements for bicycles —
Part 5:
Steering test methods
1 Scope
This document specifies the steering test methods for ISO 4210-2.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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.

ISO 4210-1, Cycles — Safety requirements for bicycles — Part 1: Vocabulary

ISO 4210-2:2023, Cycles — Safety requirements for bicycles — Part 2: Requirements for city and trekking,

young adult, mountain and racing bicycles

ISO 4210-3:2023, Cycles — Safety requirements for bicycles — Part 3: Common test methods

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4210-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Test methods
4.1 Handlebar grips and plugs
4.1.1 Freezing test

Immerse the handlebar, with handlebar grips or plugs fitted, in water at room temperature for 1 h and

then place the handlebar in a freezer until the handlebar is at a temperature lower than −5 °C. Remove

the handlebar from the freezer and allow the temperature of the handlebar to reach −5 °C, and then

apply a force of 70 N to the grip or plug in the loosening direction as shown in Figure 1. Maintain the

force until the temperature of the handlebar has reached +5 °C. It shall be permitted to create a hole in

the plug to allow for the testing fixture to be fitted so long as the hole does not affect the seat of the plug

in the handlebar and the fixture does not contact the handlebar during the test.

Temperature is measured on the handlebar 3 cm from the grip towards the centre of the handlebar.

© ISO 2023 – All rights reserved
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ISO 4210-5:2023(E)
Key
1 handlebar grip
2 handlebar
3 drawing attachment
4 hooking ring
5 clearance
F force
NOTE The hooking ring can be divided.
Figure 1 — Example of handlebar grip drawing attachment
4.1.2 Hot water test

Immerse the handlebar, with handlebar grips fitted, in hot water of +60 °C ± 2 °C for 1 h. Remove the

handlebar from the hot water, allow the handlebar to stabilize at ambient temperature for 30 min, and

apply a force of 100 N to the grip in the loosening direction as shown in Figure 1. Maintain this force for

1 min.
4.2 Handlebar stem — Lateral bending test

For stems which have a quill for insertion into a fork steerer, clamp the quill securely in a fixture to

the minimum insertion depth as specified in ISO 4210-2:2023, 4.7.3, or for stem extensions which

clamp directly on to an extended fork steerer, attach the extension to a fork steerer according to the

manufacturer's instructions and clamp this fork steerer securely in a fixture to the appropriate height.

Assemble a straight test bar to the stem, and apply a force of F at a distance of d laterally from the axis

of the stem as shown in Table 1 and Figure 2. Maintain this force for 1 min.
© ISO 2023 – All rights reserved
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ISO 4210-5:2023(E)
Table 1 — Forces and distances on handlebars
City and trekking
Bicycle type Young adult bicycle Mountain bicycle Racing bicycle
bicycle
Force, F
600 600 1 000 1 000
Distance, d
300 300 300 230
a) Combined stem and quill b) Stem extension
Key
1 minimum insertion depth
2 clamping block
3 solid-steel bar
d distance
F force
Figure 2 — Handlebar stem — Lateral bending test
4.3 Handlebar and stem assembly — Lateral bending test

Assemble the handlebar and stem in accordance with the manufacturer's instructions. Align the grips

portion of the handlebar in a plane perpendicular to the steerer axis [see Figure 3 a) or Figure 4 a)].

If perpendicular alignment is not achievable within the manufacturer’s recommended range, then the

alignment shall be as close as possible. If perpendicular alignment is achievable in multiple positions,

or for stems with adjustable length or angle, fix the stem and handlebar in positions resulting in the

maximum bending moment with respect to the steerer axis. For permanently connected handlebar and

stem, e.g. by welding or brazing, install per manufacturer's instructions. For stems which have a quill

for insertion into a fork steerer, clamp the quill securely in a fixture to the minimum insertion depth, or

for stem extensions which clamp directly on to an extended fork steerer, attach the extension to a fork

steerer according to the manufacturer's instructions and clamp this fork steerer securely in a fixture

to the appropriate height. Apply a force of F (see Table 2) at a distance of 50 mm from the free end of

© ISO 20
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