BS EN ISO 4210-5:2014 pdf download.Cycles-Safety requirements for bicycles Part 5: Steering test methods.
4.9 Handlebar and stem assembly — Fatigue test
4.9.1Test method for city and trekking, young adult, and mountain bicycles4.9.1.1Test method for stage 1
Unless the handlebar and stem are permanently connected, e.g. by welding or brazing, align the gripsof portion of the handlebar in a plane perpendicular to the stem axis [see Figure 3 a) and secure thehandlebar to the stem according to the manufacturer's instructions.
Clamp the handlebar stem securely in a fixture to the minimum insertion depth as specified inIS0 4210-2:2014,4.7.3,or in the case of a stem extension which is intended to be clamped to an extendedfork steerer secure the extension using the manufacturer's recommended tightening procedure to anextended fork steerer which is secured in fixture to the appropriate length.
For handlebars where the manufacturer states that they are not intended for use with bar ends, applyfully reversed forces of F at a position 50 mm from the free end for each side of the handlebar for100 000 cycles,with the forces at each end of the handlebar being out of phase with each other andparallel to the axis of the fork steerer as shown in Eigure 10 a). The forces are given in Table 7.Themaximum test frequency shall be maintained as specified in ISO 4210-3:2014,4.5.
whereabicyclemanufacturerfits barends,fitthe barendstothehandlebaraccordingtothe manufacturer'stightening instructions but with the bar ends located in a plane perpendicular to the handlebar stem axisand apply the out-of-phase forces to the bar ends, as shown in Figure 8 and Figure 11 a).
Where a handlebar manufacturer specifies that his handlebars are suitable for use with bar ends,conduct the test with the out-of-phase forces applied to simulated bar ends, as shown in Figure 11 b).If the handlebar meets the requirement as specified in IS0 4210-2:2014,4.7.7.2, remove any bar ends andconduct stage 2 of the test with the assembly in the same mountings.
