Page 9 - 2016-v.1-Part 5(EN)

TBIS 4210-5:2016

Table 1 — Forces and distances on handlebars

City and trekking
Bicycle type bicycles Young adult bicycles Mountain bicycles Racing bicycles

Force, F 1 N 600 600 1 000 1 000
Distance, d 300 300 300 230
mm

a) Combined stem and quill b) Stem extension

Key
1 minimum insertion depth
2 clamping block
3 solid-steel bar

Figure 2 — Handlebar stem — Lateral bending test

4.3 Handlebar and stem assembly — Lateral bending test

Assemble the handlebar and stem in accordance with the manufacturer’s instructions and, unless the
handlebar and stem are permanently connected, e.g. by welding or brazing, align the grips portion of the
handlebar in a plane perpendicular to the stem axis [see Figure 3 a) or Figure 4 a)]. For stems which have
a quill for insertion into a fork steerer, clamp the quill securely in a fixture to the minimum insertion
depth, or for stem extensions which clamp directly on to an extended fork steerer, attach the extension
to a fork steerer according to the manufacturer’s instructions and clamp this fork steerer securely in a
fixture to the appropriate height. Apply a force of F 2 (see Ta ble 2) at a distance of 50 mm from the free
end of the handlebar and parallel to the axis of the fork steerer as shown in Figures 3 or 4. Maintain this
force for 1 min.

Table 2 — Forces on handlebars
Forces in newtons

City and trekking
Bicycle type Young adult bicycles Mountain bicycles Racing bicycles
bicycles
Force, F 2 600 600 1 000 1 000

3