Operation Manual

CycleMaintenance
108
14.8.1 Conventional handlebar stem with an internal clamping mechanism
If there is too much play in the headset, follow the steps described below:
1. Loosen the upper lock nut.
2. Turn the bearing race underneath
slightly clockwise.
3. Tighten the upper lock nut. Observe the
permitted torque.
4. Check the headset play.
x If there is still play in the headset,
repeat steps 1 to 4.
5. Check whether the handlebar stem is
secure by fixing the front wheel in place
between your legs and attempting to
turn the handlebars relative to it.
6. Check the handlebar position after adjusting the headset (see the “Basic
adjustments / Handlebars and handlebar stems / Aligning the handlebars” chapter).
14.8.2 Handlebar stem with an external clamping mechanism
1. Unfasten the clamp bolts on the side of
the handlebar stem.
2. Remove the cap from the head of the
inner adjustment screw, if necessary.
3. Tighten the inner adjustment screw
further by turning it a fraction clockwise
if there is a lot of play in the headset.
4. Align the handlebar stem so that the
handlebars are perpendicular to the
front wheel.
5. Re-tighten the clamp bolts with the
permitted torque.
6. Check the headset play by placing two fingers around the upper head race, pulling
the front brake and pushing the cycle forwards and backwards.
The fork stem must not move in the head tube as you do this.
x If there is still play in the headset, repeat steps 1 to 5.
7. Check how freely the handlebars move. If the steering is heavier than before, then
the headset adjustment screw is too tight. Start again at step 1 and turn the inner
adjustment screw a fraction anticlockwise.
Illustr.: Internal clamping mechanism (example)
1 Lock nut
2 Bearing race
1
2
Illustr.: External clamping mechanism (example)
1 Inner adjustment screw
2 Clamp bolts
1
2