Adjusting the front boom
HP
Velotechnik
23
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Attention!
When you insert the
front boom, the front boom and the inner
wall of the tube must be totally free from
grease, otherwise it won’t clamp properly
and turn while you are riding.
Look beyond the bottom bracket shell at the
rear wheel axle and align the front boom
parallel to it. Align your eyes with the bottom
bracket axle and not the front derailleur tube.
Then sit down on your bicycle and check the
position.
The rear end of the front boon must never be visible in the
clamping slot.
Tighten the bolts with a torque wrench
(tightening torque 14–16 Nm). On your first
ride check whether there is sufficient clamp-
ing.
Attention!
The minimum insertion
depth of the front boom into the main
frame is 8 cm (3 1/5"). The end of the front
boom must not be visible in the clamping
slot when you look at the main frame from
below, since this may result in a damage of
the frame.
The plastic bushing between front boom and main frame must
be visible at all time
If there is no bushing or the bolts were tightened too fast, the
front boom clamping might be damaged
Danger!
There must be a bushing (a
slotted tube of plastic with edges to the
front and the clamping slot) in the main
frame’s front boom hole that is glued in
into the frame. This bushing ensures safe
clamping of the front boom and protects
the paint. It is important to take care that
this bushing is always visible at the front
end of the main frame. The lower slot has
to be aligned in coincidence with the slot
in the main frame. If this bushing is missing
or moved to the back of the tube while
inserting the front boom, safe clamping is
no longer guaranteed, even if it seems to
be the case at first glance. If the front
boom is not clamped properly it may turn
and lead to a fall. A missing or misaligned
bushing will lead to frame damage.