70
a
b
c
d
With a gentle tap on the handlebars the fork should
turn easily from the middle position. If you face any
problems during the test, contact your CENTURION
dealer.
G
Adjusting the headset requires a certain
amount of experience and should there-
fore be left to your CENTURION dealer.
Threadless headsets – Aheadset
®
This headset system is characterized by the fact that
the stem is not in the fork steerer tube but clamps it
from outside. Hence the stem is an important con-
stituent part of the headset, clamping it therefore also
sets the adjustment. You generally only need one or
two Allen keys and a torque wrench to adjust an
Aheadset®. Release the clamping bolt(s) located on
the side of the stem by one to two turns
(a)
. Gently
tighten the countersunk adjusting bolt on top a little,
e.g. by a quarter turn
(b)
, by using an Allen key.
Align the stem so that the handlebars are not slanted.
Make sure the front wheel is in line with the top tube
and the stem. Tighten up the stem clamping screws.
Use a torque wrench and never exceed the maxi-
mum torque values! You will find the prescribed val-
ues in the chapter “Recommended torque settings”,
directly on the components and/or in the operating
instructions of the component manufacturers on this
CENTURION CD-ROM.
Check the headset for play as described above
(c)
.
Take care not to tighten the bearing too much, as this
could easily destroy it.
G
Bear in mind that by overtightening the
bolts the stem can crush the steerer
tube. In particular, models with a carbon
fork steerer tube react very sensitively to over-
loading as a result of overtightening the shaft
clamp at the stem. Risk of breakage! Make sure
the clamping area is absolutely free of grease
when any of the clamping faces is made of car-
bon. Use carbon assembly paste in the clamping
areas to ensure maximum clamping.
G
Check the secure seat of the stem by
taking the front wheel between your
legs and trying to turn the handlebars
and stem relative to the wheel
(d)
. A loose stem
can cause bad accidents.
G
Never change the preloading mech-
anism in the inside of the fork steerer
tube. Never install a star nut in carbon
fork steerer tubes.
A
Do not overtighten the upper bolt, it only
serves to adjust the headset play.
i
There can be several reasons why
the bearings cannot be adjusted. If
you are not absolutely sure, ask your
CENTURION dealer for help.
Summary of Contents for ROAD BIKE ISO 4210-2
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