Page 109 - TBIS_15194-2019_(EN)_3nd
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TBIS 15194:2019

4.3.15 Saddles and seat-posts
4.3.15.1 Limiting dimensions

No part of the saddle, saddle supports, or accessories to the saddle shall be more
than 125 mm above the top saddle surface at the point where the saddle surface is

intersected by the seat-post axis.
4.3.15.2 Seat-post – Insertion-depth mark or positive stop
The seat-post shall be provided with one of the two following alternative means of

ensuring a safe insertion-depth into the frame:
a) it shall contain a permanent, transverse mark of length not less than the external

diameter or the major dimension of the cross-section of the seat-post that clearly
indicates the minimum insertion-depth of the seat-post into the frame. For a
circular cross-section, the mark shall be located not less than two diameters of the
seat-post from the bottom of the seat-post (i.e. where the diameter is the external

diameter). For a non-circular cross-section, the insertion-depth mark shall be
located not less than 65 mm from the bottom of the seat-post (i.e. where seat-post
has its full cross-section);

b) it shall incorporate a permanent stop to prevent it from being drawn out of the
frame such as to leave the insertion less than the amount specified in a) above.

4.3.15.3 Saddle/seat-post – security test
4.3.15.3.1 General

If a suspension seat-post is involved, the test may be conducted with the
suspension-system either free to operate or locked. If it is locked, the pillar shall be

at its maximum length.
4.3.15.3.2 Saddles with adjustment-clamps

When tested by the method described in 4.3.15.3.4, 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, nor 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.

4.3.15.3.3 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 4.3.15.3.4 without failure of any
components.





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