Page 60 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

4.3.7.2.3 Test method
4.3.7.2.3.1 Stage 1 Frame— Impact test (falling mass)

Assemble a roller of mass less than or equal to 1 kg and with dimensions conforming

to those shown in Figure 19 in the fork. The hardness of roller shall be not less than
60 HRC at impact surface. If a dummy fork is used in place of a fork the bar shall have
a rounded end equivalent in shape to the roller. Hold the frame-fork or frame-bar
assembly vertically with clamping to a rigid fixture by the rear-axle attachment
points as shown in Figure 19.

Rest a striker of mass 22,5 kg on the roller in the fork drop-outs or on the rounded
end of the dummy fork and measure the wheelbase. Raise the striker to a height of
h1 above the low-mass roller and release it to strike the roller or the steel bar at a
point in line with the wheel centres and against the direction of the fork rake or rake
of the bar. The drop heights are given in Table 11. The striker will bounce and this is

normal. When the striker has come to rest on the roller or dummy fork, measure the
wheelbase again.

If the fork fails, the frame shall be tested with a dummy-fork.

Table11— Drop heights and static energy absorption value

Type city and trekking young adult mountain-bicycle racing-bicycle
bicycle bicycle
Stage 1 360
Drop height h 1 (mm)
Stage 2
energy absorption 47.6 47.6 92.3 56.1
(J)

4.3.7.2.3.2 Stage 2 Frame— Static energy absorption

With the frame and front fork assembly mounted as in 4.3.7.2.3.1 apply a
progressively increasing force in the same position and direction as in 4.3.7.2.3.1,
until the energy is given in Table 11. The displacement rate is 15 mm/min.

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