Page 80 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

4.3.8.7.4 Fork for hub/disc-brake – Brake mount fatigue test

When tested by the method described in 4.3.8.7.5, there shall be no fractures or

visible cracks in any part of the fork and, in the case of suspension-forks, there shall
be no separation of any parts.
4.3.8.7.5 Fork for hub/disc-brake – Brake mount fatigue test

4.3.8.7.5.1 Stage 1 Fork for hub/disc-brake – Brake mount fatigue test

Mount the fork in a fixture representative of the head-tube according to Annex G and
gripped in the normal head-bearings, fit an axle to the fork, and mount on the axle a
pivoted, straight adaptor as shown in Figure 30 to provide a torque-arm of L2 in
length (see Table 21) and a suitable attachment for the brake mounting-point.

Apply repeated, horizontal, dynamic forces of 600 N rearward to the end of the
torque-arm parallel to the plane of the wheel (as shown in Figure 30) for C2 cycles
(see Table 22). The maximum test frequency shall be maintained as specified in

4.3.1.5.
4.3.8.7.5.2 Stage 2 Fork for hub/disc-brake – Brake mount fatigue test

With the same mounted as in 4.3.8.7.5.1. Apply repeated, dynamic forces of 700 N
rearward to the end of the torque arm, for Stage 2 C2 cycles (see Table 22). The
maximum test frequency shall be maintained as specified in 4.3.1.5.
Table 22 —test cycles

Type city and young adult mountain-bicycle racing-bicycle
trekking bicycle bicycle
Test cycles, C 2 Stage 1 14 400 14 400 14 400 24 000

Stage 2 12 000 12 000 12 000 20 000

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