GB/T 3565.6-2022 Safety requirements for bicycles - Part 6: Frame and fork test methods
1 Scope
This document describes the methods for impact test, fatigue test, assembly vibration test of bicycle frames as well as tyre-clearance test, tensile test, static bending test, rearward impact test, bending fatigue test and rearward impact test, static brake-torque test and brake mount fatigue test of forks.
This document is applicable to the test of frames and forks of bicycles involved in GB 3565.2.
2 Normative references
The following documents contain provisions 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 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 purpose of this document, the terms and definitions given in GB/T 3565.1 apply.
4 Frame test methods
4.1 Frame - Impact test (falling mass)
4.1.1 General
Manufacturers of frames are permitted to conduct the test with a dummy fork (see Annex A) fitted in place of a front fork.
Where a frame is convertible for male and female riders by the removal of a bar, test it with the bar removed.
Where a suspension fork is fitted, test the assembly with the fork extended to its unloaded free length.
Where a rear suspension system is incorporated in the frame, secure the suspension in a position equivalent to that which would occur with an 80kg rider seated on the bicycle. For young adult bicycles, secure the suspension in a position equivalent to that which would occur with a 40kg rider seated on the bicycle; if the type of suspension system does not permit it to be locked, then replace the spring/damper unit by a solid link of the appropriate size and with end fittings similar to those of the spring/damper unit.
4.1.2 Test method
Assemble a roller of mass less than or equal to 1kg and with dimensions conforming to those shown in Figure 1 in the fork. The hardness of roller shall be not less than 60HRC at impact surface. If a dummy fork is used in place of a fork, the bar shall have a rounded end equivalent in shape to the roller. Hold the frame-fork or frame-dummy fork assembly vertically with clamping to a rigid mount for rear-axle attachment points as shown in Figure 1.
Rest a striker of mass 22.5kg on the roller in the fork blade dropouts or on the rounded end of the dummy fork and measure the wheel-base. Raise the striker to a height of h1 above the low-mass roller and release it to strike the roller or the steel bar at a point in line with the wheel centers and against the direction of the fork rake or rake of the bar. The drop heights are given in Table 1. The striker will bounce during the test and this is normal. When the striker has come to rest on the roller or dummy fork, measure the wheel-base again.
If the fork fails, the frame shall be tested with a dummy fork.
Note: See GB/T 3565.3-2022, Annex B.
Table 1 Drop heights
Contents
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Frame test methods
4.1 Frame - Impact test (falling mass)
4.1.1 General
4.1.2 Test method
4.2 Frame and fork assembly - Impact test (falling frame)
4.2.1 General
4.2.2 Test method
4.3 Frame - Fatigue test with pedalling forces
4.3.1 General
4.3.2 Test method
4.4 Frame - Fatigue test with horizontal forces
4.4.1 General
4.4.2 Test method
4.5 Frame - Fatigue test with a vertical force
4.5.1 General
4.5.2 Test method
4.6 Frame and front fork assembly - Vibration test
5 Fork test methods
5.1 Suspension forks - Tyre-clearance test
5.2 Fork - Tensile test
5.2.1 Suspension forks - Tensile test
5.2.2 Rigid, non-welded fork - Tensile test
5.3 Front fork - Static bending test
5.4 Front fork - Rearward impact test
5.4.1 Test method 1
5.4.2 Test method 2
5.4.3 Test method 3
5.5 Fork - Bending fatigue test and rearward impact test
5.6 Forks intended for use with hub/disc brakes
5.6.1 General
5.6.2 Fork for hub/disc brake - Static brake-torque test
5.6.3 Fork for hub/disc brake - Brake mount fatigue test
Annex A (Normative) Dummy fork characteristics
Annex B (Normative ) Fork mounting fixture
Annex C (Informative) Suspension frames - Tyre-clearance test
GB/T 3565.6-2022 Safety requirements for bicycles - Part 6: Frame and fork test methods
1 Scope
This document describes the methods for impact test, fatigue test, assembly vibration test of bicycle frames as well as tyre-clearance test, tensile test, static bending test, rearward impact test, bending fatigue test and rearward impact test, static brake-torque test and brake mount fatigue test of forks.
This document is applicable to the test of frames and forks of bicycles involved in GB 3565.2.
2 Normative references
The following documents contain provisions 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 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 purpose of this document, the terms and definitions given in GB/T 3565.1 apply.
4 Frame test methods
4.1 Frame - Impact test (falling mass)
4.1.1 General
Manufacturers of frames are permitted to conduct the test with a dummy fork (see Annex A) fitted in place of a front fork.
Where a frame is convertible for male and female riders by the removal of a bar, test it with the bar removed.
Where a suspension fork is fitted, test the assembly with the fork extended to its unloaded free length.
Where a rear suspension system is incorporated in the frame, secure the suspension in a position equivalent to that which would occur with an 80kg rider seated on the bicycle. For young adult bicycles, secure the suspension in a position equivalent to that which would occur with a 40kg rider seated on the bicycle; if the type of suspension system does not permit it to be locked, then replace the spring/damper unit by a solid link of the appropriate size and with end fittings similar to those of the spring/damper unit.
4.1.2 Test method
Assemble a roller of mass less than or equal to 1kg and with dimensions conforming to those shown in Figure 1 in the fork. The hardness of roller shall be not less than 60HRC at impact surface. If a dummy fork is used in place of a fork, the bar shall have a rounded end equivalent in shape to the roller. Hold the frame-fork or frame-dummy fork assembly vertically with clamping to a rigid mount for rear-axle attachment points as shown in Figure 1.
Rest a striker of mass 22.5kg on the roller in the fork blade dropouts or on the rounded end of the dummy fork and measure the wheel-base. Raise the striker to a height of h1 above the low-mass roller and release it to strike the roller or the steel bar at a point in line with the wheel centers and against the direction of the fork rake or rake of the bar. The drop heights are given in Table 1. The striker will bounce during the test and this is normal. When the striker has come to rest on the roller or dummy fork, measure the wheel-base again.
If the fork fails, the frame shall be tested with a dummy fork.
Note: See GB/T 3565.3-2022, Annex B.
Table 1 Drop heights
Contents of GB/T 3565.6-2022
Contents
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Frame test methods
4.1 Frame - Impact test (falling mass)
4.1.1 General
4.1.2 Test method
4.2 Frame and fork assembly - Impact test (falling frame)
4.2.1 General
4.2.2 Test method
4.3 Frame - Fatigue test with pedalling forces
4.3.1 General
4.3.2 Test method
4.4 Frame - Fatigue test with horizontal forces
4.4.1 General
4.4.2 Test method
4.5 Frame - Fatigue test with a vertical force
4.5.1 General
4.5.2 Test method
4.6 Frame and front fork assembly - Vibration test
5 Fork test methods
5.1 Suspension forks - Tyre-clearance test
5.2 Fork - Tensile test
5.2.1 Suspension forks - Tensile test
5.2.2 Rigid, non-welded fork - Tensile test
5.3 Front fork - Static bending test
5.4 Front fork - Rearward impact test
5.4.1 Test method 1
5.4.2 Test method 2
5.4.3 Test method 3
5.5 Fork - Bending fatigue test and rearward impact test
5.6 Forks intended for use with hub/disc brakes
5.6.1 General
5.6.2 Fork for hub/disc brake - Static brake-torque test
5.6.3 Fork for hub/disc brake - Brake mount fatigue test
Annex A (Normative) Dummy fork characteristics
Annex B (Normative ) Fork mounting fixture
Annex C (Informative) Suspension frames - Tyre-clearance test
