1 Scope
This standard specifies safety and performance requirements and test methods for the design, assembly and testing of bicycles for young children of from about four to eight years of age, as well as these bicycles' sub-assemblies. It also provides guidelines for instructions on the use and care of the bicycles.
This standard is applicable to bicycles with a maximum saddle height of more than 435 mm and less than 635 mm, propelled by a transmitted drive to the rear wheel.
It is not applicable to special bicycles intended for stunting.
2 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
2.1
cycle
any vehicle that has at least two wheels and is propelled solely by the muscular energy of the person on that vehicle, in particular by means of pedals
2.2
bicycle
two-wheeled cycle
Note: The bicycles for young children specified in this standard indicates two-wheeled cycle
2.3
saddle height
vertical distance from the ground to the top of the seat surface, measured with the seat in a horizontal position and with the seat pillar set to the minimum insertion depth
2.4
braking force
force tangential to the tyre resisting rotation of the wheel when the brake is applied
2.5
(pedal) tread surface
surface of a pedal that is presented to the underside of the foot
2.6
maximum inflation pressure
maximum tyre pressure recommended by the manufacturer for safe and efficient performance
2.7
stabilizers
removable auxiliary wheels fitted to enable the rider to balance
2.8
exposed protrusion
protrusion which, through its location and rigidity, could present a hazard to the rider, either through heavy contact between it and the rider in normal use or should the rider fall onto it in an accident
3 Subassemblies
3.1 General
3.1.1 Sharp edges
Exposed edges that could come into contact with parts of the rider's body, e.g. hands and legs, during normal riding or normal handling and normal maintenance shall not be sharp.
3.1.2 Protrusions
3.1.2.1 Exposed protrusions
Any rigid, exposed protrusion longer than 8 mm (see L in Figure 1) after assembly, with the exception of a) ~ f) shall terminate in a radius, R of not less than 6.3 mm. Such protrusions shall have a major end dimension, A, of not less than 12.7 mm, and a minor dimension, B, of not less than 3.2 mm. See Figure 1.
Foreword i
1 Scope
2 Terms and definitions
3 Subassemblies
3.1 General
3.1.1 Sharp edges
3.1.2 Protrusions
3.1.3 Security and strength of safety-related fasteners
3.2 Brakes
3.2.1 Braking system
3.2.2 Hand-operated brake
3.2.3 Back-pedal brake
3.2.4 Strength of braking system
3.2.5 Braking performance
3.3 Steering
3.3.1 Handlebars
3.3.2 Handlebar grips
3.3.3 Handlebar stem
3.3.4 Steering stability
3.3.5 Strength of steering assembly
3.4 Frame/fork assembly
3.4.1 Impact test (falling mass)
3.4.2 Impact test (falling frame/fork assembly)
3.5 Front fork
3.6 Wheels
3.6.1 Rotational trueness
3.6.2 Clearance
3.6.3 Static load test
3.6.4 Wheel retention
3.7 Tyres and tubes
3.7.1 Maximum inflation pressure
3.7.2 Compatibility of inflatable tyres and rims
3.8 Pedals and pedal/crank assembly
3.8.1 Pedal tread
3.8.2 Pedal clearance
3.8.3 Pedal/crank assembly kinetic test
3.9 Saddle
3.9.1 Limiting dimensions
3.9.2 Seat pillar
3.9.3 Saddle adjustment clamp
3.9.4 Saddle strength
3.10 Drive system static load test
3.11 Chainguard
3.12 Stabilizers
3.12.1 Dimensions
3.12.2 Vertical load test
3.12.3 Longitudinal load test
3.13 Instructions
3.14 Marking
4 Test methods
4.1 General
4.2 Brake block test
4.3 Braking system load test
4.3.1 Hand-operated brake
4.3.2 Back-pedal brake
4.4 Hand-operated brake performance test
4.5 Back-pedal brake performance test
4.6 Steering assembly test
4.6.1 Handlebar stem
4.6.2 Torque test — Handlebar and stem
4.6.3 Torque test — Handlebar stem and fork stem
4.7 Impact tests on frame/fork assembly
4.7.1 Falling mass test
4.7.2 Falling frame/fork assembly test
4.8 Static load test: wheel
4.9 Pedal/crank assembly kinetic test
4.10 Static load test — Saddle and pillar
4.11 Drive-system static load test
4.11.1 General
4.11.2 Single-speed system
4.11.3 Multispeed system
4.12 Stabilizers — Vertical load test
4.13 Stabilizers — Longitudinal load test
4.14 Saddle strength test
