SIST EN ISO 4210-2:2015

Cycles - Safety requirements for bicycles - Part 2: Requirements for city and trekking, young adult, mountain and racing bicycles (ISO 4210-2:2015)

ISO 4210-2:2015 specifies safety and performance requirements for the design, assembly, and testing of bicycles and sub-assemblies having saddle height as given in Table 1, and lays down guidelines for manufacturer's instructions on the use and care of such bicycles.
This part of ISO 4210 applies to young adult bicycles with maximum saddle height of 635 mm or more and less than 750 mm, city and trekking bicycles, mountain bicycles, and racing bicycles that have a maximum saddle height of 635 mm or more including folding bicycles (see Table 1 and Figure 1).
This part of ISO 4210 does not apply to specialized types of bicycle, such as delivery bicycles, recumbent bicycles, tandems, BMX bicycles, and bicycles designed and equipped for use in severe applications such as sanctioned competition events, stunting, or aerobatic manoeuvres.
NOTE          For bicycles with a maximum saddle height of 435 mm or less, see ISO 8124‑1, and with a maximum saddle height of more than 435 mm and less than 635 mm, see ISO 8098.

Fahrräder - Sicherheitstechnische Anforderungen an Fahrräder - Teil 2: Anforderungen für City- und Trekkingfahrräder, Jugendfahrräder, Geländefahrräder (Mountainbikes) und Rennräder (ISO 4210-2:2015)

Cycles - Exigences de sécurité des bicyclettes - Partie 2: Exigences pour bicyclettes de ville et de randonnée, de jeune adulte, de montagne et de course (ISO 4210-2:2015)

L'ISO 4210-2:2015 spécifie les exigences de sécurité et de performance à observer lors de la conception, de l'assemblage et des essais des bicyclettes et de leurs sous-ensembles et précise les lignes directrices concernant les instructions d'utilisation et d'entretien fournies par les fabricants de ces bicyclettes.
L'ISO 4210-2:2015 s'applique aux bicyclettes jeunes adultes ayant une hauteur maximale de selle supérieure ou égale à 635 mm et inférieure à 750 mm, aux bicyclettes de ville et tout chemin (trekking), aux bicyclettes tout terrain et aux bicyclettes de course ayant une hauteur maximale de selle supérieure ou égale à 635 mm, y compris les bicyclettes pliantes.
L'ISO 4210-2:2015 ne s'applique pas aux types spécialisés de bicyclettes comme les bicyclettes de livraison, les bicyclettes couchées, les tandems, les bicyclettes BMX et les bicyclettes conçues et équipées pour une utilisation dans des usages sévères telles que des compétitions réglementées, des cascades ou des figures acrobatiques.

Kolesa - Varnostne zahteve za kolesa - 2. del: Zahteve za mestna in treking kolesa, kolesa za mlade, gorska in tekmovalna kolesa (ISO 4210-2:2015)

Ta del standarda ISO 4210 določa varnostne in tehnične zahteve za zasnovo, sestavo in
preskušanje koles in njihovih podsestavov z višino sedeža, podano v preglednici 1, ter določa smernice za proizvajalčeva navodila za uporabo in nego takšnih koles.
Ta del standarda ISO 4210 velja za kolesa za mlade z maksimalno višino sedeža najmanj 635 mm in največ 750 mm, mestna in treking kolesa, gorska kolesa in tekmovalna kolesa z maksimalno višino sedeža najmanj 635 mm, vključno z zložljivimi kolesi (glejte preglednico 1 in sliko 1).
Ta del standarda ISO 4210 ne velja za specializirane vrste koles, na primer dostavna kolesa, ležeča kolesa, tandemska kolesa, kolesa BMX in kolesa, zasnovana in opremljena za uporabo v zahtevnih pogojih, na primer na sankcioniranih tekmovanjih, za izvajanje trikov in akrobacij.
OPOMBA Za kolesa z maksimalno višino sedeža 435 mm ali manj glejte standard ISO 8124-1, za kolesa z maksimalno višino sedeža najmanj 435 mm in največ 635 mm pa glejte standard ISO 8098.

General Information

• Status: Withdrawn
• Public Enquiry End Date: 05-Jul-2015
• Publication Date: 01-Nov-2015
• Withdrawal Date: 01-Mar-2023
• ICS: 43.150 - Cycles
• ICS: 97.220.40 - Outdoor and water sports equipment
• Technical Committee: SPO - Sports
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 02-Mar-2023
• Due Date: 25-Mar-2023
• Completion Date: 02-Mar-2023
• Directive: 2001/95/EC - Directive 2001/95/EC of the European Parliament and of the Council of 3 December 2001 on general product safety
• Mandate: M/508 - Standardisation mandate issued to the European standardisation organisations (ESOs) to develop European standards for bicycles, bicycles for young children and luggage carriers for bicycles
• Ref Project: EN ISO 4210-2:2015 - Cycles - Safety requirements for bicycles - Part 2: Requirements for city and trekking, young adult, mountain and racing bicycles (ISO 4210-2:2015)

Relations

• Replaces: SIST EN ISO 4210-2:2014 - Cycles - Safety requirements for bicycles - Part 2: Requirements for city and trekking, young adult, mountain and racing bicycles (ISO 4210-2:2014)
• Effective Date: 01-Dec-2015
• Replaced By: SIST EN ISO 4210-2:2023 - Cycles - Safety requirements for bicycles - Part 2: Requirements for city and trekking, young adult, mountain and racing bicycles (ISO 4210-2:2023)
• Effective Date: 01-Apr-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2015
1DGRPHãþD
SIST EN ISO 4210-2:2014
Kolesa - Varnostne zahteve za kolesa - 2. del: Zahteve za mestna in treking kolesa,
kolesa za mlade, gorska in tekmovalna kolesa (ISO 4210-2:2015)
Cycles - Safety requirements for bicycles - Part 2: Requirements for city and trekking,
young adult, mountain and racing bicycles (ISO 4210-2:2015)
Fahrräder - Sicherheitstechnische Anforderungen an Fahrräder - Teil 2: Anforderungen
für City- und Trekkingfahrräder, Jugendfahrräder, Geländefahrräder (Mountainbikes) und
Rennräder (ISO 4210-2:2015)
Cycles - Exigences de sécurité des bicyclettes - Partie 2: Exigences pour bicyclettes de
ville et de randonnée, de jeune adulte, de montagne et de course (ISO 4210-2:2015)
Ta slovenski standard je istoveten z: EN ISO 4210-2:2015
ICS:
43.150 Kolesa Cycles
97.220.40 Oprema za športe na Outdoor and water sports
prostem in vodne športe equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 4210-2
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2015
EUROPÄISCHE NORM
ICS 43.150 Supersedes EN ISO 4210-2:2014
English Version
Cycles - Safety requirements for bicycles - Part 2:
Requirements for city and trekking, young adult, mountain
and racing bicycles (ISO 4210-2:2015)
Cycles - Exigences de sécurité des bicyclettes - Partie 2: Fahrräder - Sicherheitstechnische Anforderungen an
Exigences pour bicyclettes de ville et de randonnée, de Fahrräder - Teil 2: Anforderungen für City- und
jeune adulte, de montagne et de course (ISO 4210- Trekkingfahrräder, Jugendfahrräder, Geländefahrräder
2:2015) (Mountainbikes) und Rennräder (ISO 4210-2:2015)
This European Standard was approved by CEN on 8 August 2015.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4210-2:2015 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European foreword
This document (EN ISO 4210-2:2015) has been prepared by Technical Committee ISO/TC 149 “Cycles”
in collaboration with Technical Committee CEN/TC 333 “Cycles” the secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2016, and conflicting national standards shall
be withdrawn at the latest by March 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 4210-2:2014.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 4210-2:2015 has been approved by CEN as EN ISO 4210-2:2015 without any
modification.
INTERNATIONAL ISO
STANDARD 4210-2
Second edition
2015-09-01
Cycles — Safety requirements for
bicycles —
Part 2:
Requirements for city and trekking,
young adult, mountain and racing
bicycles
Cycles — Exigences de sécurité des bicyclettes —
Partie 2: Exigences pour bicyclettes de ville et de randonnée, de jeune
adulte, de montagne et de course
Reference number
ISO 4210-2:2015(E)
©
ISO 2015
ISO 4210-2:2015(E)
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2015 – All rights reserved

ISO 4210-2:2015(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Requirements . 2
4.1 Toxicity . 2
4.2 Sharp edges . 2
4.3 Security and strength of safety-related fasteners . 2
4.3.1 Security of screws . 2
4.3.2 Minimum failure torque . 3
4.3.3 Folding bicycle mechanism . 3
4.4 Crack detection methods . 3
4.5 Protrusions . 3
4.6 Brakes . 3
4.6.1 Braking systems. 3
4.6.2 Hand-operated brakes . 4
4.6.3 Attachment of brake assembly and cable requirements . 5
4.6.4 Brake-block and brake-pad assemblies — Security test . 5
4.6.5 Brake adjustment . 6
4.6.6 Hand-operated braking-system — Strength test . 6
4.6.7 Back-pedal braking system — Strength test . 6
4.6.8 Braking performance . 6
4.6.9 Brakes — Heat-resistance test . 9
4.7 Steering . 9
4.7.1 Handlebar — Dimensions . 9
4.7.2 Handlebar grips and plugs .10
4.7.3 Handlebar stem — Insertion-depth mark or positive stop .10
4.7.4 Handlebar stem to fork steerer — Clamping requirements . .10
4.7.5 Steering stability .11
4.7.6 Steering assembly — Static strength and security tests . .11
4.7.7 Handlebar and stem assembly — Fatigue test .13
4.8 Frames .13
4.8.1 Suspension-frames — Special requirements .13
4.8.2 Frame — Impact test (falling mass) .13
4.8.3 Frame and front fork assembly — Impact test (falling frame) .14
4.8.4 Frame — Fatigue test with pedalling forces .14
4.8.5 Frame — Fatigue test with horizontal forces .14
4.8.6 Frame — Fatigue test with a vertical force .14
4.9 Front fork .14
4.9.1 General.14
4.9.2 Means of location of the axle and wheel retention .14
4.9.3 Suspension forks — Special requirements .15
4.9.4 Front fork — Static bending test .15
4.9.5 Front fork — Rearward impact test .15
4.9.6 Front fork — Bending fatigue test plus rearward impact test.15
4.9.7 Forks intended for use with hub- or disc-brakes .16
4.9.8 Tensile test for a non-welded fork .16
4.10 Wheels and wheel/tyre assembly .16
4.10.1 Wheels/tyre assembly — Concentricity tolerance and lateral tolerance .16
4.10.2 Wheel/tyre assembly — Clearance .16
4.10.3 Wheel/tyre assembly — Static strength test.17
4.10.4 Wheels — Wheel retention .17
ISO 4210-2:2015(E)
4.10.5 Wheels — Quick-release devices — Operating features .18
4.11 Rims, tyres, and tubes .18
4.11.1 General.18
4.11.2 Tyre inflation pressure .18
4.11.3 Tyre and rim compatibility .18
4.11.4 Tubular tyres and rims .18
4.11.5 Rim-wear .19
4.11.6 Greenhouse effect test for composite wheels .19
4.12 Front mudguard .19
4.13 Pedals and pedal/crank drive system .19
4.13.1 Pedal tread .19
4.13.2 Pedal clearance .20
4.13.3 Pedal — Static strength test .21
4.13.4 Pedal — Impact test .21
4.13.5 Pedal — Dynamic durability test .21
4.13.6 Drive system — Static strength test .21
4.13.7 Crank assembly — Fatigue test .22
4.14 Drive-chain and drive belt .22
4.14.1 Drive-chain .22
4.14.2 Drive belt .22
4.15 Chain-wheel and belt-drive protective device .22
4.15.1 Requirements .22
4.15.2 Chain-wheel disc and drive pulley disc diameter .23
4.15.3 Chain and drive belt protective device .24
4.15.4 Combined front gear-change guide .25
4.16 Saddles and seat-posts .26
4.16.1 Limiting dimensions .26
4.16.2 Seat-post — Insertion-depth mark or positive stop .26
4.16.3 Saddle/seat-post — Security test .26
4.16.4 Saddle — Static strength test .27
4.16.5 Saddle and seat-post clamp — Fatigue test .27
4.16.6 Seat-post — Fatigue test .27
4.17 Spoke protector .27
4.18 Luggage carriers .28
4.19 Road test of a fully assembled bicycle .28
4.20 Lighting systems and reflectors .28
4.20.1 General.28
4.20.2 Wiring harness .28
4.20.3 Lighting systems .28
4.20.4 Reflectors . .28
4.21 Warning device .29
5 Manufacturer’s instructions .29
6 Marking .31
6.1 Requirement .31
6.2 Durability test .31
Annex A (informative) Steering geometry .32
Bibliography .33
iv © ISO 2015 – All rights reserved

ISO 4210-2:2015(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 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, Subcommittee SC 1, Cycles and
major sub-assemblies.
This second edition cancels and replaces the first edition (ISO 4210-2:2014), which has been
technically revised.
ISO 4210 consists of the following parts, under the general title Cycles — Safety requirements for bicycles:
— Part 1: Terms and definitions
— Part 2: Requirements for city and trekking, young adult, mountain and racing bicycles
— Part 3: Common test methods
— Part 4: Braking test methods
— Part 5: Steering test methods
— Part 6: Frame and fork test methods
— Part 7: Wheels and rim test methods
— Part 8: Pedal and drive system test methods
— Part 9: Saddles and seat-post test methods
ISO 4210-2:2015(E)
Introduction
This International Standard has been developed in response to demand throughout the world, and the
aim has been to ensure that bicycles manufactured in compliance with this International Standard
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 is to be used on public roads, national regulations apply.
For the purposes of improving repeatability and reproducibility and considering the applicability to
all types of bicycle and the size and influence of the operator, the machine test method reflects today’s
state of the art and is preferred to the track test method.
Unless there is evidence of improvement of the test track method in the future, this method will be
made informative for the next revision. Users of this International Standard are invited to provide their
feedback to ISO/TC 149/SC 1.
vi © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 4210-2:2015(E)
Cycles — Safety requirements for bicycles —
Part 2:
Requirements for city and trekking, young adult, mountain
and racing bicycles
1 Scope
This part of ISO 4210 specifies safety and performance requirements for the design, assembly, and
testing of bicycles and sub-assemblies having saddle height as given in Table 1, and lays down guidelines
for manufacturer’s instructions on the use and care of such bicycles.
This part of ISO 4210 applies to young adult bicycles with maximum saddle height of 635 mm or more
and less than 750 mm, city and trekking bicycles, mountain bicycles, and racing bicycles that have a
maximum saddle height of 635 mm or more including folding bicycles (see Table 1 and Figure 1).
This part of ISO 4210 does not apply to specialized types of bicycle, such as delivery bicycles, recumbent
bicycles, tandems, BMX bicycles, and bicycles designed and equipped for use in severe applications such
as sanctioned competition events, stunting, or aerobatic manoeuvres.
NOTE For bicycles with a maximum saddle height of 435 mm or less, see ISO 8124-1, and with a maximum
saddle height of more than 435 mm and less than 635 mm, see ISO 8098.
Table 1 — Maximum saddle height
Dimensions in millimetres
City and trekking Racing
Bicycle type Young adult bicycles Mountain bicycles
bicycles bicycles
Maximum saddle 635 or more and less
635 or more 635 or more 635 or more
height than 750
Key
H maximum saddle height
1 minimum insertion-depth mark
2 ground plane
Figure 1 — Maximum saddle height
ISO 4210-2:2015(E)
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 4210-1, Cycles — Safety requirements for bicycles — Part 1: Terms and definitions
ISO 4210-3:2014, Cycles — Safety requirements for bicycles — Part 3: Common test methods
ISO 4210-4:2014, Cycles — Safety requirements for bicycles — Part 4: Braking test methods
ISO 4210-5:2014, Cycles — Safety requirements for bicycles — Part 5: Steering test methods
ISO 4210-6:2015, Cycles — Safety requirements for bicycles — Part 6: Frame and fork test methods
ISO 4210-7:2014, Cycles — Safety requirements for bicycles — Part 7: Wheels and rims test methods
ISO 4210-8:2014, Cycles — Safety requirements for bicycles — Part 8: Pedal and drive system test methods
ISO 4210-9:2014, Cycles — Safety requirements for bicycles — Part 9: Saddles and seat-post test methods
ISO 5775-1, Bicycle tyres and rims — Part 1: Tyre designations and dimensions
ISO 5775-2, Bicycle tyres and rims — Part 2: Rims
ISO 6742-1, Cycles — Lighting and retro-reflective devices — Part 1: Lighting and light signalling devices
ISO 6742-2, Cycles — Lighting and retro-reflective devices — Part 2: Retro-reflective devices
ISO 9633, Cycle chains — Characteristics and test methods
ISO 11243, Cycles — Luggage carriers for bicycles — Concepts, classification and testing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4210-1 apply.
4 Requirements
4.1 Toxicity
Any items which come into intimate contact with the rider (i.e. causing any hazard due to sucking or
licking) shall comply with any national regulations specific to children’s products.
4.2 Sharp edges
Exposed edges that could come into contact with the rider’s hands, legs, etc., during normal riding or
normal handling and normal maintenance shall not be sharp, e.g. deburred, broken, rolled, or processed
with comparable techniques.
NOTE Refer to ISO 13715:2000.
4.3 Security and strength of safety-related fasteners
4.3.1 Security of screws
Any screws used in the assembly of suspension systems, brackets attached to electric generators, brake
mechanisms and mudguards to the frame or fork, and the saddle to the seat-post shall be provided with
2 © ISO 2015 – All rights reserved

ISO 4210-2:2015(E)
suitable locking devices, e.g. lock-washers, lock-nuts, thread locking compound, or stiff nuts. Fasteners
used to assemble hub and disc brakes should have heat-resistant locking devices.
NOTE 1 The screws used to attach the hub generator are not included.
NOTE 2 For example, mechanical and physical properties of bolts are specified in ISO 898-1.
4.3.2 Minimum failure torque
The minimum failure torque of bolted joints for the fastening of handle bars, handlebar stems, bar
ends, saddle and seat-posts shall be at least 50 % greater than the manufacturer’s recommended
tightening torque.
4.3.3 Folding bicycle mechanism
If folding bicycle mechanism is provided, it shall be designed so that the bicycle can be locked for use in
a simple, stable, safe way, and when folded, no damage shall occur to any cables. No locking mechanism
shall contact the wheels or tyres during riding, and it shall be impossible to unintentionally loosen or
unlock the folding mechanisms during riding.
4.4 Crack detection methods
Standardized methods should be used to emphasize the presence of cracks where visible cracks are
specified as criteria of failure in tests specified in this part of ISO 4210.
NOTE For example, suitable dye-penetrant methods are specified in ISO 3452-1, ISO 3452-2, ISO 3452-3, and
ISO 3452-4. In addition, white paint or surface treatment can be used to aid in detection for composite materials.
4.5 Protrusions
This requirement is intended to address the hazards associated with the users of bicycles falling on
projections or rigid components (e.g. handlebars, levers) on a bicycle, possibly causing internal injury or
skin puncture.
Tubes and rigid components in the form of projections which constitute a puncture hazard to the rider
should be protected. The size and shape of the end protection has not been stipulated, but an adequate
shape shall be given to avoid puncturing of the body. Screw threads which constitute a puncture
hazard shall be limited to a protrusion length of one major diameter of the screw beyond the internally
threaded mating part.
NOTE Handlebar ends are covered in 4.7.2.
4.6 Brakes
4.6.1 Braking systems
A bicycle shall be equipped with at least two independently actuated braking systems. At least one
shall operate on the front wheel and one on the rear wheel. The braking systems shall operate without
binding and shall be capable of meeting the braking performance requirements of 4.6.8.
Brake blocks containing asbestos shall not be permitted.
ISO 4210-2:2015(E)
4.6.2 Hand-operated brakes
4.6.2.1 Brake lever position
The brake levers for front and rear brakes shall be positioned according to the legislation or custom and
practice of the country in which the bicycle is to be sold, and the bicycle manufacturer shall state in the
manufacturer’s instructions which levers operate the front and rear brakes [see also Clause 5, item b)].
4.6.2.2 Brake lever grip dimensions
a) The brake lever similar to type A or type B
The dimension, d, measured between the outer surfaces of the brake lever in the region intended for
contact with the rider’s fingers and the handlebar or any other covering present shall cover a distance
of not less than 40 mm as shown in Figure 2 a) and Figure 2 b) and conform to the following:
— on bicycles on which the minimum intended height of the saddle is 635 mm or more, d shall not
exceed 90 mm;
— on bicycles on which the minimum intended height of the saddle is less than 635 mm, d shall not
exceed 75 mm.
Conformance shall be established by the method detailed in ISO 4210-4:2014, 4.1.1. The range of
adjustment on the brake lever should permit these dimensions to be obtained.
NOTE See Clause 5, item c) in relation to the minimum intended height of the saddle.
b) The brake lever similar to type C
It shall be possible to fit the dimension gauge shown in ISO 4210-4:2014, Figure 3 over the brake lever (or
a secondary brake lever) and the handlebar grip or any other covering in at least one position between
points B and C indicated in Figure 2 c), without causing any movement of the brake lever towards the
handlebar. The dimension d shall not exceed 100 mm.
Conformance shall be established by the method detailed in ISO 4210-4:2014, 4.1.2. The range of
adjustment on the brake lever should permit these dimensions to be obtained.
4 © ISO 2015 – All rights reserved

ISO 4210-2:2015(E)
Dimensions in millimetres
a) Type A b) Type B
c) Type C
Key
1 pivot
a distance between the last part of the lever intended for contact with the rider’s fingers and the end of the lever
B point of L/2
C point of 20 mm (in case of an extension brake lever, 15 mm) from the end of the lever
d brake lever grip dimension
L distance between the centre of the lever pivot and the lever tip end
Figure 2 — Brake lever grip dimensions
4.6.3 Attachment of brake assembly and cable requirements
Cable pinch bolts shall not sever any of the cable strands when assembled to the manufacturer’s
instructions. In the event of a cable failing, no part of the brake mechanism shall inadvertently inhibit
the rotation of the wheel.
The cable end shall either be protected with a cap that shall withstand a removal force of not less than
20 N or be otherwise treated to prevent unravelling.
NOTE See 4.3 in relation to fasteners.
4.6.4 Brake-block and brake-pad assemblies — Security test
The friction material shall be securely attached to the holder, backing plate, or shoe and there shall be
no failure of the braking system or any component thereof, and the brake shall meet the performance
requirements of 4.6.8 when tested by the method specified in ISO 4210-4:2014, 4.3.
ISO 4210-2:2015(E)
4.6.5 Brake adjustment
Each brake shall be equipped with an adjustment mechanism, either manual or automatic.
Each brake shall be capable of adjustment with or without the use of a tool to an efficient operating
position until the friction material has worn to the point of requiring replacement as recommended in
the manufacturer’s instructions. Also, when correctly adjusted, the friction material shall not contact
anything other than the intended braking surface.
The brake blocks of a bicycle with rod brakes shall not come into contact with the rim of the wheels
when the steering angle of the handlebars is set at 60°, nor shall the rods bend, or be twisted after the
handlebars are reset to the central position.
4.6.6 Hand-operated braking-system — Strength test
When tested by the method described in ISO 4210-4:2014, 4.4, there shall be no failure of the braking
system or of any component thereof.
4.6.7 Back-pedal braking system — Strength test
4.6.7.1 General
If the back-pedal braking system is fitted, the brake shall be actuated by the operator’s foot applying
force to the pedal in a direction opposite to that of the drive force. The brake mechanism shall function
regardless of any drive gear positions or adjustments. The differential between the drive and brake
positions of the crank shall not exceed 60°.
The measurement shall be taken with the crank held against each position with a pedal force of at least
250 N. The force shall be maintained for 1 min in each position.
4.6.7.2 Requirement
When tested in accordance with ISO 4210-4:2014, 4.5, there shall be no failure of the brake system or
any component thereof.
4.6.8 Braking performance
4.6.8.1 General
Two test methods are specified to determine braking performance and experience has shown that
either method is suitable and either can be used. One test method is the track test in which braking
distance is measured directly with the progressive characteristics of the brakes being self-evident. The
alternative test method is a machine/rig base test in which braking force is measured and, from which,
braking performance values are calculated. The progressive characteristics of the brake are determined
by linearity measurements. A final, simple track test checks for smooth, safe, stopping characteristics.
Whichever method is used, there shall be compliance with 4.6.8.1.1 or 4.6.8.1.2.
NOTE See ISO 4210-4:2014, 4.6.5.7 item h), test method — simple track test.
4.6.8.1.1 Track test
When tested in accordance with ISO 4210-4:2014, 4.6.3, the bicycle shall fulfil the requirements
shown in Table 2.
6 © ISO 2015 – All rights reserved

ISO 4210-2:2015(E)
Table 2 — Brake test velocities and braking distances
Maximum
Velocity corrected braking
Bicycle type Condition Brake in use
distance
km/h
m
Both 7
Dry 25
Rear only 15
City and trekking
bicycles
Both 5
Wet 16
Rear only 10
Both 7
Dry 25
Rear only 15
Young adult bicycles
Both 5
Wet 16
Rear only 10
Both 6
Dry 25
Rear only 10
Mountain bicycles
Both 5
Wet 16
Rear only 10
Racing bicycles Dry 25 Both 6
Rear only 12
Wet 16 Both 5
Rear only 10
4.6.8.1.2 Machine test
When tested in accordance with ISO 4210-4:2014, 4.6.5, the bicycle shall fulfil the requirements
shown in Table 3.
ISO 4210-2:2015(E)
Table 3 — Calculated braking performance value
Minimum braking
performance
Bicycle type Condition Brake in use
value, B
p
N
Front only 340
Dry
Rear only 220
City and trekking
bicycles
Front only 220
Wet
Rear only 140
Front only 204
Dry
Rear only 132
Young adult
bicycles
Front only 132
Wet
Rear only 84
Front only 425
Dry
Rear only 280
Mountain bicycles
Front only 220
Wet
Rear only 140
Front only 425
Dry
Rear only 260
Racing bicycles
Front only 220
Wet
Rear only 140
4.6.8.2 Smooth, safe-stop characteristics
The bicycle shall show smooth, safe-stop characteristics with regard to the intended use of the bicycle
and the ability of the expected user of the bicycle.
a) For the track test, smooth, safe-stop characteristics are defined as stopping within the required
distances without occurrence of any of the following:
1) excessive juddering;
2) front wheel locking;
3) bicycle overturning (rear wheel lifting uncontrollably);
4) rider’s loss of control;
5) excessive side-skid causing the rider to put his foot to the ground to retain control.
With certain types of braking system, it might not be possible to avoid entirely some skidding of the
rear wheel during braking; this is considered acceptable provided that item 4) or item 5) above do
not occur as a result.
Back pedal brakes shall additionally comply with the linearity test of ISO 4210-4:2014, 4.6.4.
b) For the machine test, smooth, safe-stop characteristics are defined by compliance with the
linearity requirements specified in ISO 4210-4:2014, 4.6.5.3 and the simple track test described in
ISO 4210-4:2014, 4.6.5.7 item h).
8 © ISO 2015 – All rights reserved

ISO 4210-2:2015(E)
4.6.8.3 Ratio between wet and dry braking performance
For city and trekking, young adult, and mountain bicycles, in order to ensure safety for both wet and
dry braking, the ratio of braking performance wet/dry shall be greater than 4:10.
The methods for calculating this ratio are given in ISO 4210-4:2014, 4.6.3.11 item c) for the track test
and in ISO 4210-4:2014, 4.6.5.7 item g) for the machine test.
NOTE 4.6.8.3 is not applicable to racing bicycles.
4.6.9 Brakes — Heat-resistance test
4.6.9.1 General
This test applies to all disc and hub brakes, but it applies to rim brakes only where they are known or
suspected to be manufactured from or include thermoplastic materials.
Each brake on the bicycle shall be tested individually, but where the front and rear brakes are identical,
only one brake needs to be tested.
4.6.9.2 Requirement
Throughout the test described in ISO 4210-4:2014, 4.7, the brake lever shall not touch the handlebar
grip, the operating force shall not exceed 180 N, and the braking force shall not deviate outside the
range 60 N to 115 N.
Immediately after having been subjected to the
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