Page 79 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

4.3.8.7.2 Static brake-torque test
When tested by the method described in 4.3.8.7.3, there shall be no fractures or

visible cracks in any part of the fork.

4.3.8.7.3 Fork for hub/disc-brake – Static brake-torque 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 29 to provide a torque-arm of L2
in length (see Table 21) and a suitable attachment for the brake mounting-point. If

the wheel size is not listed in Table 21, the length L2 shall be equal to one half of the
wheel diameter.

Apply a rearward force of 1 000 N to the torque arm perpendicular to the fork
steerer axis and in the plane of the wheel. Maintain this force for 1 min, then
reduce the force to 100 N and record any permanent deformation.

Table 21 — Fixture length

Wheel dimension 24" 26" 650b 29"或 700c

Arm length, L 2(mm) 305 330 349 368

1 Rigid mount incorporating head bearings
2 Brake mounting-point
3 Test adaptor
Figure 29 — Fork for hub/disc-brake: static brake-torque test

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