Page 10 - 2016-v.1-Part 9(EN)
P. 10
TBIS 4210-9:2016
4.4 Saddle and seat-post clamp — Fatigue test
4.4.1 General
Seat-posts can influence test failures of saddles. For this reason, a saddle shall be tested in combination
with a seat-post as recommended by the saddle manufacturer.
4.4.2 Test method
Insert the seat-post to its minimum insertion depth (as specified in TBIS 4210-2:2016, 4.16.2) in a
rigid mount representative of that on the bicycle and with its axis at 73° to the horizontal. The saddle
shall be positioned in the seat-post clamp assembly in a maximum rearward direction as defined by
the saddle manufacturer’s rail markings or instructions. Adjust the saddle to have its upper surface in a
horizontal plane and tighten the clamp to the torque recommended by the bicycle manufacturer. Apply
a repeated, vertically-downward force of 1 000 N for 200 000 cycles, in the position shown in Figure 4,
by means of a pad 300 mm long × 80 mm diameter to prevent localized damage of the saddle cover.
The maximum test frequency shall be maintained as specified in TBIS 4210-3:2016, 4.5.
Key
1 rigid mount
2 minimum insertion-depth mark
3 pad (length = 300 mm, diameter = 80 mm)
Figure 4 — Saddle and seat-post clamp fatigue test
4
