Safety requirements for bicycles - Part 3: Common test methods
1 Scope
This document describes the common test methods involved in GB 3565.2.
This document is applicable to the common test of bicycles referred to 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 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 3565.4-2022 Safety requirements for bicycles - Part 4: Braking test methods (ISO 4210-4:2014, MOD)
Note: There is no technical difference between the referenced content from GB/T 3565.4-2022 and that from ISO 4210.4:2014.
ISO 4201-1 Cycles - Safety requirements for bicycles - Part 1: Terms and definitions
Note: GB/T 3565.1-2022 Safety requirements for bicycles - Part 1: Terms and definitions (ISO 4210-1: 2014, MOD)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4201-1 apply.
4 Test methods
4.1 Brake tests and strength tests
4.1.1 Definition of brake tests
Brake tests to which accuracy requirements apply, as in 4.1.4, are those specified in GB 3565.2-2022, 4.6.3 to 4.6.6, GB/T 3565.4-2022, 4.2, and GB/T 3565.4-2022, 4.6.3.3.
4.1.2 Definition of strength tests
Strength tests to which accuracy requirements apply, as in 4.1.4, are those involving static, impact, or fatigue loading as specified in GB 3565.2-2022, 4.7 to 4.13, GB 3565.2-2022, 4.16, and GB 3565.2-2022, 4.20.2.
4.1.3 Numbers and condition of specimens for the strength tests
In general, for static, impact, and fatigue tests, each test shall be conducted on a new test sample, but if only one sample is available, it is permissible to conduct all of these tests on the same sample with the sequence of testing being fatigue, static, and impact.
When more than one test is conducted on the same sample, the test sequence shall be clearly recorded in the test report or record of testing. It should be noted that if more than one test is conducted on the same sample, earlier tests may influence the results of subsequent tests. Also, if a sample fails when it has been subjected to more than one test, a direct comparison with single testing is not possible.
In all strength tests, specimens shall be in the fully finished condition.
4.1.4 Accuracy tolerances of test conditions for brake tests and strength tests
Unless stated otherwise, accuracy tolerances based on the nominal values shall be as follows.
Forces and torques 0/+5%
Masses and weights ±1%
Size ±1mm
Angle ±1°
Duration ±5s
Temperature ±2℃
Pressure ±5%
4.2 Front mudguard test methods
4.2.1 Front mudguard with stays test methods
4.2.1.1 Stage 1: Test method - Tangential obstruction
Insert a 12mm-diameter steel rod between the spokes, in contact with the rim and below the front mudguard stays as shown in Figure 1, and rotate the wheel to apply a tangentially upward force of 160N, against the front mudguard stays; maintain this force for 1 min.
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Test methods
4.1 Brake tests and strength tests
4.2 Front mudguard test methods
4.3 Road test on a fully assembled bicycle test methods
4.4 Durability test of marking
4.5 Fatigue test
4.6 Fatigue test for composite components
4.7 Impact test
4.8 Plastic material test ambient temperature
Annex A (Informative) Structural integrity of the fully assembled bicycle
Annex B (Informative) Verification of free-fall velocity
Bibliography
