Page 26 - 20190101 part 6 (EN)

limits noted above, and if no fractures can be observed, perform the impact resistance test described
in 5.4.1 (the drop heights are given in Table 7). When the striker has come to rest on the roller,
measure the permanent deformation under the roller and inspect the sample carefully for fractures.

Table 9 — Forces on loading attachment

Forces in newtons
City and trekking Young adult
Bicycle type Mountain bicycles Racing bicycles
bicycles bicycles
Stage 1 Force, F 6 ±450 ±450 ±650 ±620

Stage 2 Force, F 6 ±500 ±500 ±700 ±670

Key
1 pivoted force attachment
2 rigid mount incorporating head bearings

Figure 10 — Front fork — Bending fatigue test

5.6 Forks intended for use with hub or disc brakes

5.6.1 General

When a fork is intended for use with a hub or disc brake and whether supplied as original equipment or
as an accessory, the fork manufacturer shall provide an attachment point on the fork blade for the torque
arm or calliper.

In tests conducted by the methods described in 5.6.2 and 5.6.3 and where more than one mounting point
is provided for a hub or disc brake, the following shall apply:

a) where a complete bicycle is supplied, the test adaptor shall be secured to the mounting point used
on the bicycle. If bracket will be supplied, it shall be used to perform the test;

b) where a fork is supplied as an accessory with more than one mounting point, separate tests shall be
conducted on each of the mounting points on separate forks.

5.6.2 Fork for hub/disc brake — Static brake-torque test

Mount the fork in a fixture representative of the head tube according to Annex B 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 11 to provide a torque arm of L 2 in length (see Ta ble 10) and a suitable attachment for the brake
mounting point. If the wheel size is not listed in Ta ble 10, the length L 2 shall be equal to one-half of the
wheel diameter.

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