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47
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 noticea-
bly 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 Conventional Headsets
For the adjustment of conventional headsets you need to flat, open-end
wrenches. Depending on the diameter of the headset the width of the
open-end wrench is 32 millimetres at least.
Hold the front wheel tight between your legs, apply the wrench and
release to top counter nut.
Turn the lower bearing cup race a little downwards. Do not tighten
the bearing cup race! This could damage the bearing immediately.
Keep the bearing cup race tight with a wrench to maintain the ad-
justment. Tighten the counter nut with the second open-end wrench
against the bearing cup race.
Check it again for play. If the fork cannot be turned without any
resistance and play, the bearing is improperly adjusted. Adjust the
bearing play once again. This procedure of adjusting can take several
attempts. The important thing is that the bearing turns without any
resistance and play. This is the only way to ensure a long service life.
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 experience 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 head-
set manufacturer on the
STEVENS CD-ROM before
doing any adjusting.
48


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