Page 62 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

seated in a normal riding position on the bicycle when it is equipped with the
suspension fork. (In case of young adult bicycles, apply 40 kg)

Where a rear suspension system is incorporated in the frame, secure the
spring/damper unit in a position equivalent to that which would occur with an 90 kg

rider seated on the bicycle; if the type of suspension system does not permit it to be
locked, then replace the spring/damper unit by a solid link of the appropriate size
and with end fittings similar to those of the spring/damper unit. (In case of young
adult bicycles, apply 40 kg)

4.3.7.3.2 Requirement

When tested by the method described in 4.3.7.3.3, there shall be no visible cracks or
fractures in the assembly and after the second impact there shall be no separation of

any parts of any suspension system. The permanent deformation measured between
the axes of the wheel axles shall not exceed the values specified in Table 12.

Table 11 — The values of permanent deformation

Dimensions in millimetres

Type city and young adult mountain-bicycle racing-bicycle
trekking bicycle bicycle
Permanent 60 60 60 15

deformation

4.3.7.3.3 Test method

4.3.7.3.3.1 Stage 1 Frame and front fork assembly — Impact test (falling frame)
Conduct the test on the assembly used for the test in 4.3.7.2.

As shown in Figure 20, mount the frame-fork assembly at its rear axle attachment
points so that it is free to rotate about the rear axle in a vertical plane. Support the
front fork on a flat steel anvil so that the frame is in its normal position of use.

Securely fix mass M1 to the seat-post as shown in Figure 2 0 with the centre of
gravity at distance D (= 75 mm) along the seat-post axis from the insertion point, and
fix masses of M1, M2, and M3 (see Table 13) to the top of the steering head, the

seat-post, and the bottom bracket respectively, as shown in Figure 20.
Measure the wheelbase with the three masses in place. Rotate the assembly about
the rear axle until the distance between the low-mass roller and the anvil is h2 then

allow the assembly to fall freely to impact on the anvil.
Repeat the test and then measure the wheelbase again with the three masses in

place and the roller resting on the anvil.

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