Page 14 - 2016-v.1-Part 5(EN)

TBIS 4210-5:2016

4.6 Handlebar stem to fork steerer — Torsional security test

Assemble the fork steerer correctly in the frame and attach the handlebar stem to the fork steerer with
the locking system tightened in accordance with the manufacturer’s instructions, and apply a torque of
T 2 once in each direction of possible rotation by applying a force on the test bar in a plane perpendicular
to the axis of the fork steerer/handlebar stem. Maintain each torque for 1 min. The torque is given in
Ta ble 5. The exact method of applying the torque can vary, and an example is shown in Figure 7.

Table 5 — Torque on handlebar stem
Torques in newton metres

City and trekking Young adult bicy-
Bicycle type Mountain bicycles Racing bicycles
bicycles cles
Torque, T 2 40 40 50 40

Key
1 frame and fork assembly
2 solid-steel bar

Figure 7 — Handlebar stem to fork steerer — Torsional security test

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