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Adjusting the front boom
24
HP
Velotechnik
Danger!
If the bolts are tightened
too much or bent, the screw or the frame
can break! If the clamping is insufficient the
front boom can turn during a ride which
may cause your feet to slip from the pedals
and lead to injuries.
After moving the bottom bracket tube your
dealer has to adjust the chain length. By de-
fault the bicycle comes with a very long chain
so the adjustment range of the bicycle can be
fully used without the need to lengthen the
chain.
After the basic adjustment of the leg length
done by your dealer before handing over the
bicycle, the chain has to be shortened so that
the derailleur cage is not fully turned forward
while shifting on the largest chainring in front
and the smallest sprocket behind. The derail-
leur must still be able to compensate a length
change of the chain of at least 4 cm (1 1/2"). In
order to choose the right chain length, please
consult the manual of the derailleur manufac-
turer.
Danger!
After the chain has been
shortened it must be closed with a special
closing link or a chain riveting tool that
expands the rivet while riveting (e.g.
Rohloff-Revolver). A poorly joined chain
may break and thus lead to damage or inju-
ry.
Attention!
Take care that the chain
tubes have a clearance of at least 5 cm (2")
to the rear derailleur and the front derail-
leur even under maximum tension of the
chain and make sure that the tubes are
held tight in their fastenings. The front up-
per tube can be moved to the rear for
length adjustment. Shorten the tubes if
necessary. If the end of the chain tube gets
in touch with the rotating chainrings it can
be locked-up and destroyed. The chain
tubes must be prevented from moving by a
rubber tube over the retention spring.
Check that there is at least a 5 cm (2") clearance between the
end of the chain tube and other parts of the drive train.
Attention!
The chain tubes must be
fixed to the holding spring with a rubber
tube
We recommend to slightly readjust the front
boom every 3 months so that knees in order
to provide a slightly different position to your
muscles and ankles. You might also find a
more comfortable and more efficient riding
position.
A wrong adjustment may lead to pain in your
knees and inefficient pedalling. In addition we
recommend riding with a high pedalling ca-
dence, which means to pedal fast and with