CEN/TR 17653:2021

SLOVENSKI STANDARD
01-september-2021
Kolesa - Sestavni deli in sklopi za kolesa - Inovativne zahteve in preskusne metode
Cycles - Components and assemblies used in bicycles - Innovative requirements and
test methods
Fahrräder - Verbundwerkstoffe für Fahrräder - Neue Spezifische Prüfverfahren für aus
Verbundwerkstoffe hergestellte Komponenten
Ta slovenski standard je istoveten z: CEN/TR 17653:2021
ICS:
43.150 Kolesa Cycles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TR 17653
TECHNICAL REPORT
RAPPORT TECHNIQUE
June 2021
TECHNISCHER BERICHT
ICS 43.150
English Version
Cycles - Components and assemblies used in bicycles -
Innovative requirements and test methods
Fahrräder - Verbundwerkstoffe für Fahrräder - Neue
Spezifische Prüfverfahren für aus Verbundwerkstoffe
hergestellte Komponenten
This Technical Report was approved by CEN on 30 May 2021. It has been drawn up by the Technical Committee CEN/TC 333.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 17653:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Frames designed for disc brake . 4
4.1 Background . 4
4.2 Test methods . 5
4.2.1 Rear brake mount tests . 5
4.2.2 Static rear brake torque test . 5
4.2.3 Rear brake mount fatigue test . 5
5 Fork made of composite materials designed for disc brakes . 7
5.1 General . 7
5.2 Test methods . 7
6 Wheel impact test . 9
6.1 Background . 9
6.2 Requirements . 9
6.3 Test methods . 10
7 Front mudguard . 12
7.1 Background . 12
7.2 Requirements . 12

European foreword
This document (CEN/TR 17653:2021) has been prepared by Technical Committee CEN/TC 333 “Cycles”,
the secretariat of which is held by UNI.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
1 Scope
The purpose of this document is to provide innovative requirements and test methods applicable to any
components and assemblies of any category of bicycles (city, trekking, MTB, young adult and racing). Its
aim is to provide technical solutions that reduce the risk of component failure and rider injury during the
specified use of such bicycles.
This document makes reference to current “state of the art” standards in the field of bicycles, agreed at
CEN level through the publication of the EN ISO 4210 series of standards. Therefore, the requirements
and tests proposed in this document are intended to be read and applied in accordance with the
appropriate EN ISO 4210 standard.
NOTE The tests described in this document refer in places to clause numbers from the applicable
EN ISO 4210 series.
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.
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)
EN ISO 4210-3:2014, Cycles - Safety requirements for bicycles - Part 3: Common test methods
(ISO 4210-3:2014)
EN ISO 4210-4:2014, Cycles - Safety requirements for bicycles - Part 4: Braking test methods
(ISO 4210-4:2014)
EN ISO 4210-6:2015, Cycles - Safety requirements for bicycles - Part 6: Frame and fork test methods
(ISO 4210-6:2015)
EN ISO 4210-7:2014, Cycles - Safety requirements for bicycles - Part 7: Wheels and rims test methods
(ISO 4210-7:2014)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Frames designed for disc brake
4.1 Background
The forces applied to a bicycle frame by disc brakes are different in magnitude and location to those
applied by rim brakes, so specific tests and requirements are necessary to ensure safety. This section sets
out test procedures and minimum safety requirements for disc brake frames.
4.2 Test methods
4.2.1 Rear brake mount tests
4.2.1.1 General
When a frame is intended for use with a disc brake and whether supplied as original equipment or as an
accessory, the frame manufacturer shall provide an attachment point on the frame for the caliper.
4.2.2 Static rear brake torque test
Mount the frame in its normal attitude in a fixture and secured either at the rear wheel axis or at the
bottom bracket so that is not restrained in a rotary sense as shown in Figure 1a) or Figure 1b). Fit a
suitable roller to the front axle in order to permit the frame to flex in a fore/aft sense under the test forces.
A dummy fork can be fitted in place of the front fork.
Install a stiff, vertical link with an arm length R according to the maximum outer radius of the tyre
w
intended for use with the frame or, if this value is not specified by the manufacturer, according to the
maximum wheel diameter as given in Table 2. Further install a rigidly mounted brake disc of appropriate
diameter at the rear dropouts by means of an axle being free to swivel about the axis of the axle but
providing rigidity in a lateral plane.
The brake torque shall be introduced into the brake mount via the link arm in the same way as the actual
caliper would do, i.e.:
a) the link arm can rotate freely on the rear axle;
b) the minimum brake rotor diameter specified by the manufacturer is simulated appropriately; and
c) the link arm is supported by the brake mounts so that only the tangential force, acting on the effective
rotor radius in actual use, is introduced into a suitable brake caliper dummy.
Under no circumstances a rigid connection is to be created between link arm and brake caliper mount, as
shown in Figure 1 c).
Apply a rearward force of 700 N to the link arm against the direction of travel. Maintain this force for 1
min, then reduce the force to 0 and apply a force of 300 N in direction of travel, again maintain this force
for 1 min and release the force.
4.2.3 Rear brake mount fatigue test
Mount the frame in its normal attitude in a fixture in the same manner as for the static rear brake torque
test as shown in Figure 1a) or Figure 1b).
Apply cycles of dynamic, horizontal forces of F in a rearward direction and F in a forward direction to
1 2
the link arm for 20 000 test cycles as shown in Table 1 and Figure 1.
Table 1 — Forces at rear disc brake
Forces in Newton
City and trekking
Bicycle type Young adult bicycle Mountain bicycle Racing bicycle
bicycle
Rearward force, F
500 300 500 400
Forward force, F
50 50 200 50
Table 2 — Fixture length
Dimensions in millimetres
Wheel diameter 20” 24” 26” 650b 29” or 700c
Arm length, R
254 305 330 349 368
W
a) fixing the frame to the rear wheel axis

c) applying of the test force
b) fixing the frame to the bottom bracket via the link arm
Key
1 rigid, pivoted mounting
2 free-running guided roller or similar movable bearing
3 locked suspension unit or solid link for pivoted chain stays
4 locking device on brake mount / caliper dummy
5 test adapter for force attachment, free to rotate around the axis of rotation of the rear wheel
6 rotational degree of freedom
R wheel radius according to the maximum outer radius of the tire or according to Table 2
W
R disc brake mean radius
d
Figure 1 — Frames for disc-brakes — Rear brake mount fatigue test
5 Fork made of composite materials designed for disc brakes
5.1 General
This test shall only apply to forks that contain composite structure at the disc brake caliper mount.
With the development of road (racing) bicycles that utilize new disc brake technology for stopping (either
hydraulic or cable actuated), it is important to understand the result of thermal impact on composites.
This type of thermal loading or thermal input to the brake caliper, brake mount or fork drop out could
possibly cause delamination or dis-bonding. While most scenarios will never see this type of heat
application, it is possible for this happen. It is necessary for safety standards to address this issue.
Requirements (addition to EN ISO 4210 series).
When tested by the method described in 5.2, there shall be no fracture or visible cracks in any part of the
fork and, in the case of suspension forks, there shall be no separation of any parts.
5.2 Test methods
When a fork is intended for use with a hub or disc brake and whether supplied as original equipment or
as an accessory, the fork manufacturer shall provide an attachment point on the fork blade for the torque
arm or caliper.
Where more than one mounting point is provided for a disc brake, the following shall apply:
a) where a complete bicycle is supplied, the test adaptor shall be secured to the mounting point used
on the bicycle. If a bracket is supplied, it shall be used to perform the test;
b) where a fork is supplied as an accessory with more than one mounting point, separate tests shall be
conducted on each of the mounting points on separate forks. The smallest rotor size permitted by the
manufacturer shall be the rotor size used as a test dimension when conducting the test. The rotor
clamp point (size dependent) should be consistent with the test fixture.
Mount the fork in a fixture representative of the head tube according to EN ISO 4210-6:2015, Annex B
and gripped in the normal head-bearings to fit an axle to the fork, and mount on the axle a pivoted,
straight adaptor as shown in Figure 2 to provide a torque arm of L in length (Table 3). The brake
mounting point shall also act as a heat sink capable of applying a constant temperature (Table 4), for
phase one of the test (see Table 4). The brake attachment arm and brake mounting point with heat sink
for disc brake fatigue is shown in Figure 2 and Figure 3.
The position of the shoulder bolt (item 5 in Figure 2) shall be the same as the brake pad intended to be
used. Washers shall not be used for the thermal sensor at the brake mounting points.
Apply repeated, dynamic forces of 600 N rearward to the end of the torque arm, perpendicular to the fork
steerer axis and in the plane of the wheel (as shown in Figure 2) for the specified cycles and phase one
temperature (see Table 4).
The maximum test frequency shall be maintained as specifi
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