Page 64 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019
4.3.7.4 Frame – Fatigue test with pedalling forces

4.3.7.4.1 General

All types of frame shall be subjected to this test.

In tests on suspension-frames with pivoted joints, adjust the spring, air-pressure, or
damper to provide maximum resistance, or, for a pneumatic damper in which the

air-pressure cannot be adjusted, replace the suspension-unit with a rigid link,
ensuring that its end fixings and lateral rigidity accurately simulate those of the
original unit. For suspension-frames in which the chain-stays do not have pivots but

rely on flexing, ensure that any dampers are set to provide the minimum resistance
in order to ensure adequate testing of the frame.

Where a suspension-frame has adjustable brackets or linkages to vary the resistance
of the bicycle against the ground-contact forces or to vary the attitude of the bicycle,
arrange the positions of these adjustable components to ensure maximum forces in

the frame.
4.3.7.4.2 Requirement

When tested by the method described in 4.3.7.4.3, there shall be no visible cracks or
fractures in any part of the frame, and there shall be no separation of any parts of
the suspension system.

For composite frames, the running displacements (peak-to-peak values) at the points
where the test forces are applied shall not increase by more than 20 % of the initial

values (see 4.3.1.6).
4.3.7.4.3 Test method

4.3.7.4.3.1 Stage 1 Frame – Fatigue test with pedalling forces

Use a new frame/fork assembly fitted with standard head-tube bearings for the test.
The front fork may be replaced by a dummy fork (see Annex G) of the same length

and at least the same stiffness as the original fork.

If a genuine fork is used, failures of the fork are possible, therefore, it is
recommended that for convenience, a dummy fork stiffer and stronger than the
genuine fork is used.

Where a frame is convertible for male and female riders by the removal of a bar, test
it with the bar removed.

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