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8.3. Adjusting the Threadless Headset:
Aheadset® Headsets
The special feature of this system is that the stem is not encased by, but
rather clamped onto the steerer tube, which in this case is threadless.
The stem is an important part of the headset bearings. Its clamping
force secures the bearing in its set position.
Some frames are delivered with the headset already mounted in the
steerer tube. The headset is then no longer visible. There is a seamless
transition of spacer and the fork into the steerer tube. The adjustment of
the bearing is the same as with the usual Aheadset®-headset. But in this
case you check the bearing play in the transition area of frame and fork.
Release the clamping bolt(s) located on the side of the stem by one to
two complete turns.
Gently tighten a little the countersunk adjusting bolt on the top, i.e.
by a quarter turn at the most, by using an Allen key.
Realign the stem with the frame so that the handlebars are not slant-
ed when the wheel points straight ahead.
The Headset
Retighten a little the clamping bolt(s) of the stem until the stem no
longer turns relative to the fork. Do not exceed the torque values
specified by the stem manufacturer, see chapter “Recommended
Torque Settings.
Check the headset for play, as described further above. Take care not
to overtighten the bearings, as this could easily damage them.
Danger:
Check the secure seat of the
stem after having adjusted
the bearings, by holding the
front wheel between your
knees and trying to twist
the handlebars relative to
the front wheel. A loose
stem can throw you off your
bicycle!
Caution:
Do not overtighten the
upper bolt, it only serves
the purpose of adjusting
the bearing play, not of
securing the stem!
Caution: In the case of full carbon forks the torque values
are often clearly below the specifications of the
stem manufacturers. A sufficient clamping is usually already achieved
with inferior forces. Tighten carefully by approaching the prescribed
maximum torque value in small steps until the stem no longer turns
relative to the fork or front wheel. Too high torque values can destroy the
steerer tube! To ensure a larger clamping surface, slide a spacer on top of
the stem.
49


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