Page 19 - 20190101 part 6 (EN)

4.5.2.2 Stage 2
With the frame and front fork assembly mounted as in 4.5.2.1. Apply cycles of dynamic,
vertically-downward forces of stage 2 F 4 at a point 70 mm behind the intersection of the axes of the
solid steel bar and the extension piece, E, as shown in Figure 5 for 50 000 test cycles. The forces
are given in Table 5. The maximum test frequency shall be maintained as specified in TBIS 4210-
3:2016, 4.5.

Table 5 — Forces on seat stem
Forces in newtons

City and trekking Young adult
Bicycle type bicycles bicycles Mountain bicycles Racing bicycles
Stage 1 F 4 1 000 500 1 200 1 200
Stage 2 F 4 1100 600 1300 1300

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