Page 53 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

4.3.6.6.2.4 Requirement for Stage 2

When tested by the method described in 4.3.6.6.2.5, there shall be no visible cracks
or fractures.

4.3.6.6.2.5 Test method for Stage 2

With the handlebar-stem mounted as in Stage 1, apply a progressively increasing
force in the same position and direction as in stage 1 until either the force reaches a

maximum of F4 or until the handlebar-stem deflects 50 mm measured at the point of
application of the test force and in the direction of the test force. If the stem does
not yield or continue to yield, maintain the force for 1 min. The forces are given in
Table 5.

Table 5 — Forces on stems

Stage 2 Forces F 4(N) 2600

4.3.6.6.3 Handlebar-stem to fork steerer – Torsional security test

4.3.6.6.3.1 Requirement

When tested by the method described in 4.3.6.6.4.2, there shall be no movement of
the handlebar-stem relative to the fork steerer.

4.3.6.6.3.2 Test method

NOTE The exact method of applying the torque may vary, and an example is shown
in Figure 14.

If bar-ends are fitted by the manufacturer, the test forces shall be applied to them in
the test, as shown later in Figure 18a). If according to the manufacturer's instructions

bar-ends may be used, simulated bar-ends (as shown in Figure 18b)) shall be used for
the test.

Table 6 — Torque on handlebar

type city and young adult mountain-bicycle racing-bicycle
trekking bicycle bicycle

Torque T 1(Nm) 70 70 80 70

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