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TBIS 15194:2019
4.3.15.6.3.2 Test method for stage 1-2 (fatigue test)
Apply a repeated, vertically downward, dynamic force of stage 1-2 F3 to the point
described above and shown in Figure 52 for 100 000 cycles. The forces are given in
Table 32. The maximum test frequency shall be maintained as specified in Sec.
4.3.1.5.
Table 32 — Forces on seat-post
Force in N
Type city and young adult mountain-bicycle racing-bicycle
trekking bicycle bicycle
stage 1-1 Force, F 3 1000 1000 1200 1200
stage 1-2 Force, F 3 1100 1100 1300 1300
Dimensions in millimetres
1 Minimum insertion-depth mark
Figure 51 —Seat-post – Fatigue test
4.3.15.6.4 Requirement for stage 2
4.3.15.6.4.1 Seat-post without suspension system
When tested by the method described in 4.3.15.6.5, there shall be no fractures, and
the displacement shall not exceed 10 mm during testing.
4.3.15.6.4.2 Seat-post with suspension system
When tested by the method described in 4.3.15.6.5, there shall be no fractures. The
design shall be such that in the event of failure of the suspension system, the two
main parts do not separate nor does the upper part(i.e. the part to which the saddle
would be attached) become free to swivel in the lower part.
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