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TBIS 15194:2019
4.3.15.5 Saddle and seat-post clamp – Fatigue test
4.3.15.5.1 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.
4.3.15.5.2 Requirement
When tested by method described in 4.3.15.5.3, there shall be no fractures or visible
cracks in the seat-post or in the saddle, and no loosening of the clamp.
4.3.15.5.3 Test method
Insert the seat-post to its minimum insertion depth 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 51 by means of a
pad 300 mm long x 80 mm diameter to prevent localized damage of the saddle cover.
The maximum test frequency shall be maintained as specified in 4.3.1.5.
1 Rigid mount
2 Minimum insertion-depth mark
3 Pad (length = 300 mm, diameter = 80 mm)
Figure 51 —Saddle and seat-post clamp – Fatigue test
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