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fork, irrespective of the amount of permanent deformation, there shall be no relative movement between
the steerer and the crown.
4.9.6 Front fork — Bending fatigue test plus rearward impact test
When tested by the method described in TBIS 4210-6:2017, 5.5, there shall be no fractures 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 45 mm.
For composite forks, the running displacement (peak-to-peak value) at the points where the test forces
are applied shall not increase by more than 20 % for rigid forks or more than 40 % for suspension forks
from the initial values (see TBIS 4210-3:2016, 4.6).
Conduct the test in two stages on the same assembly.
4.9.7 Forks intended for use with hub- or disc-brakes
4.9.7.1 Static brake-torque test
When tested by the method described in TBIS 4210-6:2017, 5.6.2, there shall be no fractures or
visible cracks in any part of the fork, and record the ratio between weight and rigidity in the test
result.
4.9.7.2 Fork for hub/disc-brake — Brake mount fatigue test
When tested by the method described in TBIS 4210-6:2017, 5.6.3, 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.
Conduct the test in two stages on the same assembly.
4.9.8 Tensile test for a non-welded fork
4.9.8.1 General
This test is for forks where the blades and/or the fork steerer are secured in the fork-crown by press-
fitting, clamping, adhesives, or any method other than brazing or welding. It can be convenient to
combine this test with the wheel retention test in 4.10.4.
4.9.8.2 Requirement
When tested by the method described in TBIS 4210-6:2017, 5.7, there shall be no detachment or
loosening of any parts of the assembly.
4.10 Wheels and wheel/tyre assembly
4.10.1 Wheels/tyre assembly — Concentricity tolerance and lateral tolerance
When measured by the method described in TBIS 4210-7:2017, 4.1, the run-out shall not exceed the
values which are given in Ta ble 7.
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