Page 36 - 2018-v.3-Part 2(EN)
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4.16.3 Saddle/seat-post — Security test
4.16.3.1 Saddles with adjustment-clamps
When tested by the method described in TBIS 4210-9:2016, 4.2, there shall be no movement of the
saddle adjustment clamp in any direction with respect to the seat-post, or of the seat-post with
respect to the frame, or any failure of saddle, adjustment clamp, or seat-post. If the saddle design is
such that it cannot accurately test the saddle/seat-post clamp, it shall be possible to use a fixture which
is representative of the saddle dimensions.
4.16.3.2 Saddles without adjustment clamps
Saddles that are not clamped, but are designed to pivot in a vertical plane with respect to the seat-post,
shall be allowed to move within the parameters of the design and shall withstand the tests described in
TBIS 4210-9:2016, 4.2 without failure of any components.
4.16.4 Saddle — Static strength test
When tested by the method described in TBIS 4210-9:2016, 4.3, the saddle cover and/or plastic
moulding shall not disengage from the chassis of the saddle, and there shall be no cracking or permanent
distortion of the saddle assembly.
4.16.5 Saddle and seat-post clamp — Fatigue test
When tested by method described in TBIS 4210-9:2016, 4.4, there shall be no fractures or visible
cracks in the seat-post or in the saddle, and no loosening of the clamp.
4.16.6 Seat-post — Fatigue test
Conduct the test in two stages on the same assembly as per 4.16.6.1 and 4.16.6.2.
4.16.6.1 Requirement for stage 1
4.16.6.1.1 Seat-post without suspension system
When tested by the method described in TBIS 4210-9:2016, 4.5.2, there shall be no visible cracks
or fractures in the seat-post, or any bolt failure.
For composite seat-post, the running displacement (peak-to-peak value) at the point where the test
forces are applied shall not increase by more than 20 % of the initial value (see TBIS 4210-3:2016, 4.6).
4.16.6.1.2 Seat-post with suspension system
When tested by the method described in TBIS 4210-9:2016, 4.5.2, there shall be no visible cracks
or fractures in the seat-post, or any bolt failure. 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.
4.16.6.2 Requirement for stage 2
4.16.6.2.1 Seat-post without suspension system
When tested by the method described in TBIS 4210-9:2016, 4.5.3, there shall be no fractures and
the displacement shall not exceed 10 mm during testing.
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