Page 72 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

4.3.8.3.2 Tensile test
4.3.8.3.2.1 Requirement

When tested by the method described in 4.3.8.3.2.2, there shall be no detachment
or loosening of any parts of the assembly and the tubular, telescopic components of
any fork-leg shall not separate under the test force.

4.3.8.3.2.2 Test method
Mount the fork steerer securely in a suitable rigid mount, keeping any clamping

forces away from the fork-crown, and apply a tensile force of 2 300 N distributed
equally between the two drop-outs in a direction parallel to the axis of the fork
steerer and in the direction away from the fork-crown. Maintain this force for 1 min.

4.3.8.4 Front fork – Static bending test
4.3.8.4.1 Requirement

When tested by the method described in 4.3.8.4.2, there shall be no fractures or
visible cracks in any part of the fork, and the permanent deformation, measured as

the displacement of the axis of the wheel-axle or simulated axle in relation to the
axis of the fork steerer, shall not exceed 10 mm.
And record the ratio between weight and rigidity in the test result.

4.3.8.4.2 Test method

Mount the fork according to Annex G and fit a loading-attachment and swivel on an
axle located in the axle slots of the blades (see Figure 24). Locate a deflection
measuring device over the loading-attachment in order to measure deflection and
permanent deformation of the fork perpendicular to the steerer axis and in the plane
of the wheel.

1 Loading attachment swivel on axle
2 Deflection measuring device
3 Rigid mount incorporating head bearings

Figure 24 — Front fork: static bending test (typical arrangement)

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