Page 69 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

4.3.7.6 Frame – Fatigue test with a vertical force
4.3.7.6.1 General
Where a frame is convertible for male and female riders by the removal of a bar,
remove the bar.如果車

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. Secure the rear suspension as described in 4.3.7.4.1.
If a suspension fork is fitted lock it at a length equivalent to that with an 90 kg rider
seated on the bicycle either by adjusting the spring/damper or by external means.

(In case of young adult bicycles, apply 40 kg)
4.3.7.6.2 Requirement

When tested by the method described in 4.3.7.6.3, there shall be no visible cracks or
fractures in the frame and there shall be no separation of any parts of the
suspension system.

For composite frames, 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 4.3.1.6).

4.3.7.6.3 est method
4.3.7.6.3.1 Stage 1 Frame – Fatigue test with a vertical force

Mount the frame in its normal attitude and secured at the rear drop-outs so that is
not restrained in a rotary sense (i.e. preferably by the rear axle) as shown in Figure
23. Fit a suitable roller to the front axle in order to permit the frame to flex in a

fore/aft sense under the test forces.
Insert intended seat post at minimum insertion depth or equivalent to a seat-stem to
a depth of 75 mm in the top of the seat-tube and secure this to the manufacturer's

instructions by the normal clamp. Securely attach a horizontal, rearward extension (E
in Figure 23) to the top of this bar such that its length (dimension h3 in Figure 23)
places Point H in a position equivalent to that of the centre of the saddle-clamp with
the bicycle at its maximum saddle height recommended for the particular frame, or

if the maximum saddle height information is not available dimension h3 shall be 250
mm.
Apply cycles of dynamic, vertically-downward forces of F4 at a point 70 mm behind

the intersection of the axes of the solid steel bar and the extension piece, E, as
shown in Figure 23 for 60 000 test cycles. The forces are given in Table 16. The
maximum test frequency shall be maintained as specified in 4.3.1.5.

第 61 頁共 162 頁