60
Threadless headset: “Aheadset“
The special feature of this system is that the stem does not sit within the fork
steerer tube, but rather is clamped onto the outside of the fork steerer tube, which
in this case is threadless. The stem is an important part of the headset bearing
system. Its clamping force secures the bearings in the correct running position.
Instead of special tools you need in most cases only Allen keys.
Release the clamping bolts (I) located on the side of the stem by one to two com-
plete turns.
Using an Allen key, gently tighten the countersunk adjusting bolt (II) on top of the
stem a little, e.g. by a quarter turn (a).
Do not over tighten the bolt, it only serves the purpose of adjusting the
bearing play, not securing of the stem!
!!
After adjustment, realign the stem so that the handlebars are in line with the front
hub. Check that the front wheel is aligned with the top tube of the frame and the
stem (b).
Using a torque wrench, tighten the stem clamping bolts again according to the
values given in the enclosed manuals or printed directly on the component (c).
You should not be able to turn the stem relative to the fork after tightening the
bolts (d).
Check the headset for play as described above. Take care not to tighten the bear-
ings too much, as this could easily damage them.
Check the stem clamping bolts are securely tightened, after having
adjusted the bearings, by holding the front wheel between your knees
and trying to twist the handlebars against the front wheel. A loose stem
will cause an accident.
a b c d
II
I
To Next Page
Loading...
