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48
8. The Headset
The headset connects fork, stem, handlebars and front wheel to the
frame, but allows them to turn freely as a unit. It must turn with vir-
tually no resistance, if the bicycle is to run straight, stabilising itself as
it travels. Shocks caused by uneven road surfaces expose the headset to
considerable levels of stress. It may therefore happen to become loose
and maladjusted.
8.1. Checking the Bearing Play
Check the headset for play by placing your fingers around the upper
head cup.
Pull the front brakes with your other hand and push the bicycle firmly
back and forth with the wheel remaining on the ground.
If there is play in the bearing, the upper head cap will move noticeably
relative to the lower cup and you will feel a jerk.
Another way to check the headset is to lift the front wheel a little off
the ground and then let it drop. If there is play in the bearing, you will
hear a rattling noise in this area.
To check the bearing for ease of running, lift the frame until the front
wheel no longer touches the ground. Move the handlebars from the
left to the right. The front wheel should turn very easily from far left
to far right and back without catching anywhere. A light tap on the
handlebars should be enough to turn the wheel to the side.
8.2. 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 head
tube. The headset is then no longer visible. There is a seamless transition
of spacer and the fork into the head 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.
The Headset
Danger:
Riding the bike with a loose
headset increases the stress
on fork and bearing. This can
result in fork breakage with
severe consequences!
Caution:
Adjusting the headset requires
a certain amount of experi-
ence and should therefore be
left to your STEVENS dealer.
If you want to try it on your
own, be sure to read the
operating instructions of the
headset manufacturer on
the STEVENS CD-ROM before
doing any adjusting.
49


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