ISO 5775-1:2023

Bicycle tyres and rims — Part 1: Tyre designations and dimensions

This document specifies the designations and dimensions for the following pneumatic bicycle tyres: — clincher tyres mounted on straight side or crotchet type rims; — tubeless tyres; — tubeless-ready tyres; — tube-type tyres; — “beaded edge” tyres mounted on hooked bead rims. This document does not apply to tubular sew-up tyres and non-pneumatic tyres.

Pneumatiques et jantes pour cycles — Partie 1: Désignation et cotes des pneumatiques

General Information

• Status: Published
• Publication Date: 27-Jul-2023
• ICS: 83.160.10 - Road vehicle tyres
• Technical Committee: ISO/TC 31/SC 10 - Cycle, moped, motorcycle tyres and rims
• Drafting Committee: ISO/TC 31/SC 10/WG 16 - Tyre designations and dimensions for Bicycle tyres and rims
• Current Stage: 6060 - International Standard published
• Start Date: 28-Jul-2023
• Due Date: 18-Feb-2023
• Completion Date: 28-Jul-2023

Relations

• Revises: ISO 5775-1:2014 - Bicycle tyres and rims — Part 1: Tyre designations and dimensions
• Effective Date: 23-Apr-2020

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 5775-1
Seventh edition
2023-07
Bicycle tyres and rims —
Part 1:
Tyre designations and dimensions
Pneumatiques et jantes pour cycles —
Partie 1: Désignation et cotes des pneumatiques
Reference number
ISO 5775-1:2023(E)
© ISO 2023

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ISO 5775-1:2023(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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
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ISO 5775-1:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 1
3.1 Terms and definitions . 1
3.2 Symbols and abbreviated terms . 2
4 Clincher tyres mounted on straight side or crotchet type rims . 2
4.1 Tyre nomenclature . 2
4.2 Tyre size designation and marking . 3
4.2.1 General . 3
4.2.2 Nominal size designation. 3
4.2.3 Overall size designation . 4
4.2.4 Old size marking . 6
4.2.5 Other service characteristics . 6
4.2.6 Examples . 8
4.3 Tyre dimensions . 8
4.3.1 General . 8
4.3.2 Design tyre dimensions . 8
4.3.3 Tyre measurement method . 9
4.3.4 Dimensional specifications . 10
4.4 Recommended rim widths in use . 11
5 “Beaded edge” tyres mounted on hooked bead (HB) rims.12
5.1 General .12
5.2 Tyre designation .12
5.2.1 General .12
5.2.2 Tyre size designation .13
5.2.3 Preferred direction of rotation. 13
5.2.4 Example . 13
5.3 Tyre dimensions . 13
5.3.1 General .13
5.3.2 “Design tyre” dimensions . 13
5.3.3 Calculation of maximum tyre dimensions in service . 14
5.3.4 Determination of nominal overall diameter code . 14
5.3.5 Values. 15
5.4 Tyre dimension measurement method . 15
5.5 Tyres that can be mounted on both hooked bead (HB) and straight side rims .15
5.5.1 Tyre designation .15
5.5.2 Maximum tyre dimensions in service . 15
Annex A (informative) Old size marking .16
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ISO 5775-1:2023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
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 31, Tyres, rims and valves, Subcommittee
SC 10, Cycle, moped, motorcycle tyres and rims.
This seventh edition cancels and replaces the sixth edition (ISO 5775-1:2014), which has been
technically revised.
The main changes are as follows:
— new definitions have been added for clarification in Clause 3;
— the symbols and abbreviated terms have been revised in 3.2;
— new requirements have been added for clarification in Clause 4.
A list of all parts in the ISO 5775 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.
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INTERNATIONAL STANDARD ISO 5775-1:2023(E)
Bicycle tyres and rims —
Part 1:
Tyre designations and dimensions
1 Scope
This document specifies the designations and dimensions for the following pneumatic bicycle tyres:
— clincher tyres mounted on straight side or crotchet type rims;
— tubeless tyres;
— tubeless-ready tyres;
— tube-type tyres;
— “beaded edge” tyres mounted on hooked bead rims.
This document does not apply to tubular sew-up tyres and non-pneumatic tyres.
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 4223-1, Definitions of some terms used in the tyre industry — Part 1: Pneumatic tyres
ISO 5775-2:2021, Bicycle tyres and rims — Part 2: Rims
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4223-1, ISO 5775-2 and the
following apply.
ISO and IEC maintain terminology 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/
3.1.1
clincher tyre
tyre that has beads that lock onto the rim bead seat and/or rim hook when the tyre is inflated
3.1.1.1
tubeless tyre
TL
clincher tyre (3.1.1) that is functional without an inner tube or sealant to maintain inflation pressure
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ISO 5775-1:2023(E)
3.1.1.2
tubeless-ready tyre
TLR
clincher tyre (3.1.1) that is functional without an inner tube but requires sealant to maintain inflation
pressure
3.1.1.3
tube-type tyre
clincher tyre (3.1.1) that is only functional with an inner tube to maintain inflation pressure
3.1.2
tubular sew-up tyre
completely enclosed tyre with or without an inner tube that is either glued or taped onto the rim
Note 1 to entry: All clincher tyre types defined in 3.1.1.1 to 3.1.1.3 may also be referred to as “open tubular tyre”
if the tread is glued or vulcanized onto a non-vulcanized casing
3.2 Symbols and abbreviated terms
D design overall diameter
design
D maximum overall diameter
O,max
R design rim width
design
R measuring rim width
m
S design section width
S minimum section width
min
S nominal section width
N
H design section height
design
W overall width
W maximum overall width
max
C crotchet type rim
SS straight-side type rim
TC tubeless crotchet type rim
TSS tubeless straight-side type rim
4 Clincher tyres mounted on straight side or crotchet type rims
4.1 Tyre nomenclature
Tyre nomenclature is shown in Figure 1.
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ISO 5775-1:2023(E)
Key
1 overall width (W)
2 section width (S)
3 overall diameter (D )
O
4 measuring rim width (R )
m
5 specified rim diameter (D)
6 tread
7 sidewall
8 bead
9 rim
Figure 1 — Sections of a cycle tyre showing components and nomenclature
4.2 Tyre size designation and marking
4.2.1 General
Clincher tyres shall be marked with the nominal size designation in accordance with 4.2.2. The other
markings shall conform to 4.2.3 to 4.2.5.
4.2.2 Nominal size designation
4.2.2.1 General
The nominal size designation shall be indicated clearly visible on the side, even when the tyre is
mounted as follows:
Nominal section width – Nominal rim diameter code
4.2.2.2 Nominal section width
The nominal section width is the designated inflated section width, the tyre is designed to measure on
the design rim at maximum pressure. It shall be expressed in millimetres, as an integer number.
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ISO 5775-1:2023(E)
4.2.2.3 Nominal rim diameter code
The nominal rim diameter code reflects the nominal bead seat diameter of the rim, that the tyre is
designed for. It shall be expressed in millimetres.
NOTE Nominal rim diameter codes are in ISO 5775-2:2021, Table 2.
4.2.3 Overall size designation
4.2.3.1 General
If the tyre size is characterized by a corresponding overall size designation, the overall size shall be
designated as follows:
Overall diameter code × Overall width code
4.2.3.2 Overall diameter code
The overall diameter shall be expressed as code. Refer to Table 1 for the overall diameter code that
corresponds to the nominal rim diameter code of the tyre.
Table 1 — Correspondence of nominal rim diameter code and overall diameter code
Nominal rim diameter code Overall diameter code
203 12,5
254 14
305 16
349 16
355 18
406 20
507 24
559 26
584 27,5
a)
622 29
a)
For nominal section width 50 and below, overall diameter code 28 is accepted.
4.2.3.3 Overall width code
The overall width shall be expressed as code. Refer to Table 2 for the correspondence of overall width
code to the overall width expressed in millimetres.
Table 2 — Overall width code
Overall width Overall width code
mm
18 0,70
19 0,75
20 0,80
21 0,85
22 0,85
23 0,90
24 0,95
25 1,00
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ISO 5775-1:2023(E)
TTaabbllee 22 ((ccoonnttiinnueuedd))
Overall width Overall width code
mm
26 1,00
27 1,05
28 1,10
29 1,15
30 1,20
31 1,20
32 1,25
33 1,30
34 1,35
35 1,40
36 1,40
37 1,45
38 1,50
39 1,55
40 1,55
41 1,60
42 1,65
43 1,70
44 1,75
45 1,75
46 1,80
47 1,85
48 1,90
49 1,95
50 2,00
51 2,00
52 2,00
53 2,10
54 2,10
55 2,20
56 2,20
57 2,20
58 2,30
59 2,30
60 2,40
61 2,40
62 2,40
63 2,50
64 2,50
65 2,60
66 2,60
67 2,60
68 2,70
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ISO 5775-1:2023(E)
TTaabbllee 22 ((ccoonnttiinnueuedd))
Overall width Overall width code
mm
69 2,70
70 2,80
71 2,80
75 3,00
76 3,00
80 3,10
85 3,30
90 3,50
95 3,70
100 3,90
102 4,00
105 4,10
110 4,30
115 4,50
120 4,70
122 4,80
125 4,90
127 5,00
130 5,10
132 5,20
4.2.4 Old size marking
To help customers in those countries where other systems of marking were used, the old size marking
may be separated by parentheses or “/” before or after the tyre size designation.
It is suggested that characters smaller than those used for the nominal size designation specified in
4.2.2 be adopted. See Annex A for correspondence between “nominal size designation” and “old size
marking”. Sizes not included in Annex A shall bear the nominal size designation.
4.2.5 Other service characteristics
4.2.5.1 Tubeless marking
Tubeless tyres shall be marked with “TUBELESS” or “TL” clearly visible on the side, even when the tyre
is mounted.
Tubeless-ready tyres shall be marked with “TUBELESS READY” or “TLR” clearly visible on the side,
even when the tyre is mounted.
Tube-type tyres may be marked with “TUBE TYPE” clearly visible on the side, even when the tyre is
mounted.
4.2.5.2 Directional arrow
In the case of a preferred direction of rotation of the tyre, an arrow may be shown clearly visible on the
side, even when the tyre is mounted, to indicate that direction.
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ISO 5775-1:2023(E)
4.2.5.3 Marking of tyres designed for crotchet-type rims only
Tyres designed for crotchet-type rims only may be marked with “MOUNT ONLY ON HOOKED RIMS” or
“MOUNT ONLY ON CROTCHET-TYPE RIMS”.
4.2.5.4 Pressure des
...

DRAFT INTERNATIONAL STANDARD
ISO/DIS 5775-1
ISO/TC 31/SC 10 Secretariat: UNI
Voting begins on: Voting terminates on:
2022-10-12 2023-01-04
Bicycle tyres and rims —
Part 1:
Tyre designations and dimensions
Pneumatiques et jantes pour cycles —
Partie 1: Désignation et cotes des pneumatiques
ICS: 83.160.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
This document is circulated as received from the committee secretariat.
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 5775-1:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022

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ISO/DIS 5775-1:2022(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 5775-1
ISO/TC 31/SC 10 Secretariat: UNI
Voting begins on: Voting terminates on:

Bicycle tyres and rims —
Part 1:
Tyre designations and dimensions
Pneumatiques et jantes pour cycles —
Partie 1: Désignation et cotes des pneumatiques
ICS: 83.160.10
COPYRIGHT PROTECTED DOCUMENT
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2022
THEREFORE SUBJECT TO CHANGE AND MAY
This document is circulated as received from the committee secretariat.
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
IN ADDITION TO THEIR EVALUATION AS
or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
Phone: [phone]
WHICH REFERENCE MAY BE MADE IN
Reference number
Email: [e-mail]
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 5775-1:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
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PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022

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ISO/DIS 5775-1:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Clincher tyres mounted on straight side or crotchet type rims . 2
4.1 Tyre nomenclature . 2
4.2 Tire size designation and marking . 2
4.2.1 Nominal size designation. 2
4.2.2 Overall size designation . 3
4.2.3 Old size marking . 5
4.2.4 Other service characteristics . 5
4.2.5 Examples . 7
4.3 Tyre dimensions . 7
4.3.1 Design tyre dimensions . 7
4.3.2 Tyre measurement method . 9
4.3.3 Dimensional specifications . 9
4.4 Recommended rim widths in use . 10
5 “Beaded edge” tyres mounted on hooked bead (HB) rims.12
5.1 Tyre designation . 13
5.1.1 Tyre size designation .13
5.1.2 Preferred direction of rotation. 13
5.1.3 Example .13
5.2 Tyre dimensions . 13
5.2.1 “Design tyre” dimensions . 13
5.2.2 Calculation of maximum tyre dimensions in service . 14
5.2.3 Determination of nominal overall diameter code . 14
5.2.4 Values. 15
5.3 Tyre dimension measurement method . 15
5.4 Tyres than can be mounted on both hooked bead (HB) and straight side rims .15
5.4.1 Tyre designation . 15
5.4.2 Maximum tyre dimensions in service . 15
Annex A (informative) Old size marking .16
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ISO/DIS 5775-1:2022(E)
Foreword
The main changes compared to the previous edition are as follows:
— new definitions have been added for clarification in Clause 3;
— new requirements have been added for clarification in Clause 4;
— the symbols and abbreviated terms have been revised in Clause 4;
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DRAFT INTERNATIONAL STANDARD ISO/DIS 5775-1:2022(E)
Bicycle tyres and rims —
Part 1:
Tyre designations and dimensions
1 Scope
This part of ISO 5775 specifies the designations and dimensions for the following pneumatic bicycle
tyres:
— Clincher tyres mounted on straight side or crotchet type rims
— Tubeless tyres
— Tubeless-ready tyres
— Tube-type
— “beaded edge” tyres mounted on hooked bead rims.
Tubular sew-up tyres and non-pneumatic tyres are not covered by this part of ISO 5775.
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 4223-1, Definitions of some terms used in the tyre industry — Part 1: Pneumatic tyres
ISO 5775-2, Bicycle tyres and rims — Part 2: Rims
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4223-1 and ISO 5775-2 and
the following apply.
3.1
clincher tyre
tyre that has beads that lock onto the rim bead seat and/or rim hook when the tyre is inflated
3.1.1
tubeless tyre (TL)
clincher tyre (3.1) that is functional without an inner tube or sealant to maintain inflation pressure
3.1.2
tubeless-ready tyre (TLR)
clincher tyre (3.1) that is functional without and inner tube but requires sealant to maintain inflation
pressure
3.1.3
tube-type tyre
clincher tyre (3.1) that is only functional with an inner tube to maintain inflation pressure
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ISO/DIS 5775-1:2022(E)
3.2
tubular sew-up tyre
completely enclosed tyre with or without an inner tube that is either glued or taped onto the rim.
Note 1 to entry: All clincher tyre types defined in 3.1.1 to 3.1.3 may also be referred to as “open tubular tyre” if
the tread is glued or vulcanized onto a non-vulcanized casing
4 Clincher tyres mounted on straight side or crotchet type rims
4.1 Tyre nomenclature
Tyre nomenclature is shown in Figure 1.
Key
1 overall width (W)
2 section width (S)
3 maximum overall diameter (D )
O
4 measuring rim width (R )
m
5 specified rim diameter (D)
6 tread
7 side wall
8 bead
9 rim
Figure 1 — Sections of a cycle tyre showing components and nomenclature
4.2 Tire size designation and marking
Clincher tyres shall be marked with the nominal size designation pursuant to 4.2.1. The other markings
shall comply with 4.2.2. through 4.2.4.
4.2.1 Nominal size designation
The nominal size designation shall be indicated as follows:
Nominal Section Width – Nominal Rim Diameter Code
4.2.1.1 Nominal section width
The nominal section width is the designated inflated section width the tire is designed to measure on
the design rim at maximum pressure. It shall be expressed in millimetres, as an integer number.
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ISO/DIS 5775-1:2022(E)
4.2.1.2 Nominal rim diameter code
The nominal rim diameter code reflects the nominal bead seat diameter of the rim that the tire is
designed for. It shall be expressed in millimetres.
NOTE Nominal rim diameter codes are in Table 2 of ISO 5775-2.
4.2.2 Overall size designation
If the tyre size is characterized by a corresponding overall size designation, the overall size shall be
designated as follows:
Overall Diameter Code x Overall Width Code
4.2.2.1 Overall diameter code
The overall diameter shall be expressed as code. Refer to Table 1 for the overall diameter code that
corresponds to the nominal rim diameter code of the tyre.
Table 1 — Correspondence of nominal rim diameter code and overall diameter code
Nominal rim diameter code Overall diameter code
203 12,5
254 14
305 16
349 16
355 18
406 20
507 24
559 26
584 27,5
622 29
4.2.2.2 Overall width code
The overall width shall be expressed as code. Refer to Table 2 for the correspondence of overall width
code to the overall width expressed in millimetres.
Table 2 — Overall width code
Overall width Overall width code
in mm
18 0,70
19 0,75
20 0,80
21 0,85
22 0,85
23 0,90
24 0,95
25 1,00
26 1,00
27 1,05
28 1,10
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ISO/DIS 5775-1:2022(E)
Table 2 (continued)
Overall width Overall width code
in mm
29 1,15
30 1,20
31 1,20
32 1,25
33 1,30
34 1,35
35 1,40
36 1,40
37 1,45
38 1,50
39 1,55
40 1,55
41 1,60
42 1,65
43 1,70
44 1,75
45 1,75
46 1,80
47 1,85
48 1,90
49 1,95
50 2,00
51 2,00
52 2,00
53 2,10
54 2,10
55 2,20
56 2,20
57 2,20
58 2,30
59 2,30
60 2,40
61 2,40
62 2,40
63 2,50
64 2,50
65 2,60
66 2,60
67 2,60
68 2,70
69 2,70
70 2,80
71 2,80
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ISO/DIS 5775-1:2022(E)
Table 2 (continued)
Overall width Overall width code
in mm
75 3,00
76 3,00
80 3,10
85 3,30
90 3,50
95 3,70
100 3,90
102 4,00
105 4,10
110 4,30
115 4,50
120 4,70
122 4,80
125 4,90
130 5,10
132 5,20
4.2.3 Old size marking
To help customers in those Countries where other systems of marking were used, the old size marking
may be separated by parentheses or "/" before or after the tyre size designation.
It is suggested that characters smaller than those used for the designation specified in 4.2.1 be adopted.
See informative Annex A for correspondence between “tyre size designation” and “old size marking”.
Sizes not included in Annex A shall bear the tyre size designation and corresponding nominal size.
4.2.4 Other service characteristics
4.2.4.1 Tubeless marking
Tubeless tyre shall be marked with “TUBELESS” or “TL” on the tyre sidewall.
Tubeless-ready tyre shall be marked with “TUBELESS READY” or “TLR” on the tyre sidewall.
Tube-type tyre may be marked with “TUBE TYPE” on the tyre sidewall.
4.2.4.2 Directional arrow
In the case of a preferred direction of rotation of the tyre, an arrow may be shown on the tyre sidewall
to indicate that direction.
4.2.4.3 Marking of tyres designed for crotchet-type rims only
Tyres designed for crotchet-type rims only may be marked with "MOUNT ONLY ON HOOKED RIMS" or
"MOUNT ONLY ON CROTCHET-TYPE RIMS".
5
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ISO/DIS 5775-1:2022(E)
4.2.4.4 Pressure designation
The maximum inflation pressure shall be marked in kilopascals in multiples of 10. It may be marked in
addition in bars and PSI where the PSI value shall be calculated by multiplying the kilopascal value by
0,145 and rounding the result down to the closest integer.
An additional maximum pressure for use on straight side type rims (SS/TSS) may be indicated. See
Table 3 for recommended maximum pressures for straight side type rims.
Table 3 — Maximum pressure for straight side type rims (SS/TSS)
Tyre Nominal section width S Straight side type rim maximum pressure in
N
(mm) service (kPa)
18 – 24 550
25 – 29 500
30 – 34 450
35 – 39 400
40 – 44 350
45 – 54 300
55 – 64 250
65 – 74 200
75 – 84 150
It is recommended that the deflection of the tyre in use not exceed 30 % of the tyre section height at the
minimum inflation pressure, if it is specified on the tyre.
See example in 4.2.5.
4.2.4.5 Rim line
The rim line is an indicator that may be visible and concentric above the rim sidewall when the beads
are fully seated (see Figure 2). If the rim line is not concentric with the rim edge, the bead is not fully
seated.
Key
1 rim line
Figure 2 — Rim line
4.2.4.6 Additional indications
Other markings may be added to indicate the following:
a) Minimum inflation pressure
b) Recommended inflation pressure
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ISO/DIS 5775-1:2022(E)
c) Design rim
d) Recommended rim width range
e) Other characteristics
4.2.5 Examples
A tyre
...