HP Velotechnik trikes - Manual (Page 32)

Adjusting to your size
28
Caution! Take care that the
chain tubes have a clearance of at least 5
cm (2") to the rear derailleur and the front
derailleur 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 chain rings it can
be locked-up and destroyed. The chain
tubes must be prevented from moving by a
rubber tube over the retention spring.
Adjusting the length with front boom
quick adjust
The front boom quick adjust is additional
equipment for HP V
ELOTECHNIK
recumbents
that feature a telescopic front boom for leg
length adjustment. It replaces the standard
bolts of the front boom clamping by quick re-
lease levers. Two pulleys provide chain length
compensation while moving the front boom.
Routing of the chain over the idlers of the front boom
quick adjust
The front boom must be clean and free from
wax or tenacious remains of chain lube to
make sure it can be easily slid in and out.
First, shift the chain to the largest chain ring
and the largest sprocket to check the correct
chain length.
Open both quick release levers. Slide the
front boom into the frame or pull it out until
you’ve reached the required frame length.
To slide the front boom in, grip the cranks
and turn them against the tensioned chain.
The force on the chain helps to move the
front boom into the frame tube.
To pull the front boom out, grip the derailleur
tube if available. If you pull at the cranks, you’ll
have to turn them backwards at the same
time, else the tensioned chain will balk the
motion.
Moving the front boom is easier when turning
it a little bit from side to side. When doing
this, make sure the pulley bracket doesn’t
scratch the frame and its lug won’t be bent.
That’s why we recommend to only turn the
front boom clockwise (and back afterwards)
when looking from the front.
Align the bottom bracket axis horizontally
when looking from the front. Close both
quick release levers.
Move the chain to the smallest chain ring and
the smallest sprocket. Check the chain length.
The rear derailleur cage should not be com-
pletely swivelled to the back to still apply ten-
sion to the chain.
Please pay attention to the instructions about
quick release levers on page 8.