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.
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Foreword
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
4 Clincher tyres mounted on straight side or crotchet type rims
4.1 Tyre nomenclature
4.2 Tyre size designation and marking
4.2.1 General
4.2.2 Nominal size designation
4.2.3 Overall size designation
4.2.4 Old size marking
4.2.5 Other service characteristics
4.2.6 Examples
4.3 Tyre dimensions
4.3.1 General
4.3.2 Design tyre dimensions
4.3.3 Tyre measurement method
4.3.4 Dimensional specifications
4.4 Recommended rim widths in use
5 “Beaded edge” tyres mounted on hooked bead (HB) rims
5.1 General
5.2 Tyre designation
5.2.1 General
5.2.2 Tyre size designation
5.2.3 Preferred direction of rotation
5.2.4 Example
5.3 Tyre dimensions
5.3.1 General
5.3.2 “Design tyre” dimensions
5.3.3 Calculation of maximum tyre dimensions in service
5.3.4 Determination of nominal overall diameter code
5.3.5 Values
5.4 Tyre dimension measurement method
5.5 Tyres that can be mounted on both hooked bead (HB) and straight side rims
5.5.1 Tyre designation
5.5.2 Maximum tyre dimensions in service
Annex A (informative) Old size marking
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Foreword
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
4 Clincher tyres mounted on straight side or crotchet type rims
4.1 Tyre nomenclature
4.2 Tyre size designation and marking
4.2.1 General
4.2.2 Nominal size designation
4.2.3 Overall size designation
4.2.4 Old size marking
4.2.5 Other service characteristics
4.2.6 Examples
4.3 Tyre dimensions
4.3.1 General
4.3.2 Design tyre dimensions
4.3.3 Tyre measurement method
4.3.4 Dimensional specifications
4.4 Recommended rim widths in use
5 “Beaded edge” tyres mounted on hooked bead (HB) rims
5.1 General
5.2 Tyre designation
5.2.1 General
5.2.2 Tyre size designation
5.2.3 Preferred direction of rotation
5.2.4 Example
5.3 Tyre dimensions
5.3.1 General
5.3.2 “Design tyre” dimensions
5.3.3 Calculation of maximum tyre dimensions in service
5.3.4 Determination of nominal overall diameter code
5.3.5 Values
5.4 Tyre dimension measurement method
5.5 Tyres that can be mounted on both hooked bead (HB) and straight side rims
5.5.1 Tyre designation
5.5.2 Maximum tyre dimensions in service
Annex A (informative) Old size marking