Page 56 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

Table 8 — Forces on bar-end
type city and young adult mountain-bicycle racing-bicycle
trekking bicycle bicycle

Forces F 5(N) 300 300 500 300

a) b) c )

Figure 16 — Bar-end to handlebar: torsional security test

4.3.6.7 Handlebar and stem assembly – Fatigue test

4.3.6.7.1 General

Handlebar-stems can influence test failures of handlebars and for this reason, a

handlebar shall always be tested mounted in a stem, but it is permitted to test a
stem with a solid bar in place of the handlebar and bar-ends with dimensions
corresponding to handlebars/bar-ends suitable for that stem.

When the fatigue test is for the stem only, the manufacturer of the stem shall specify
the types and sizes of handlebar for which the stem is intended and the test shall be

based on the most severe combination.
Conduct the test in two stages on the same assembly.

4.3.6.7.2 Requirement for Stage 1 and Stage 2
When tested by the method described in 4.3.6.7.3 or 4.3.6.7.4, there shall be no

visible cracks or fractures in any part of the handlebar and stem assembly or any bolt
failure.

For composite handlebars or stems, the running displacements (peak-to-peak value)
at the points where the test forces are applied shall not increase by more than 20 %
of the initial values.

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