Safety requirements for bicycles - Part 9: Saddle and seat-post test methods
1 Scope
This document specifies the method for security test, static strength test, fatigue test, fatigue test and static strength test of saddle and seat-post of bicycles.
This document is applicable to the test of saddle and seat-post components for bicycles involved in GB 3565.2.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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.
GB/T 3565.1 Safety requirements for bicycles - Part 1: Terms and definitions (GB/T 3565.1-2022, ISO 4210-1:2014, MOD)
GB 3565.2-2022 Safety requirements for bicycles - Part 2: Requirements for city and trekking, young adult, mountain and racing bicycles (ISO 4210-2:2015, MOD)
Note: There is no technical difference between the referenced content from GB/T 3565.2-2022 and that from ISO 4210-2:2015.
GB/T 3565.3-2022 Safety requirements for bicycles - Part 3: Common test methods (ISO 4210-3:2014, IDT)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 3565.1 apply.
4 Test methods
4.1 General
If a suspension seat-post is involved, the test may be conducted with the suspension system either free to operate or locked. If it is locked, the seat-post shall be at its maximum length.
4.2 Saddle/seat-post - Security test
With the seat-post correctly assembled to the bicycle frame at minimum insertion depth of the seat-post (as specified in GB 3565.2-2022, 4.16.2), and the clamps tightened to the torque recommended by the bicycle manufacturer, apply a force of F1 vertically downwards at a point 25mm from either the front or rear of the saddle, whichever produces the greater torque on the saddle clamp. The saddle shall be positioned in the seat-post clamp assembly as defined by the saddle manufacturer’s rail markings or instructions. Maintain this force for 1min. Remove this force and apply a lateral force of F2 horizontally at a point 25mm from either the front or rear of the saddle and maintain this force for 1min, whichever produces the greater torque on the clamp (see Figure 1). The forces are given in Table 1. The fixture shall be such that it does not damage the surface of the saddle.
Table 1 Forces on saddle
Foreword i
Introduction iv
1 Scope
2 Normative references
3 Terms and definitions
4 Test methods
4.1 General
4.2 Saddle/seat-post - Security test
4.3 Saddle - Static strength test
4.4 Saddle and seat-post clamp - Fatigue test
4.4.1 General
4.4.2 Test method
4.5 Seat-post - Fatigue test and static strength test
4.5.1 General
4.5.2 Test method for stage 1 (fatigue test)
4.5.3 Test method for stage 2 (static strength test)
