HP Velotechnik trikes - Manual (Page 29)

25
Handling instructions
Adjusting to your size
Adjusting the front boom
In order to adjust the leg length you have to
move the front boom (the front part of the
frame where the cranks are mounted) in the
main frame.
Lösen der Klemmschrauben zum Verstellen des Tretla-
gerauslegers.
Unscrew the bolts M8x35 under the main
tube with a 6 mm Allen key. Take a grip on
the front derailleur tube or both cranks and
move the front boom further into the frame
or pull it out while cautiously turning it.
Before you pull out the front boom shift the
chain to the smallest chain ring and sprocket.
Turn the cranks a little bit backwards while
pulling. Thus the chain is not under tension.
Caution! After you have un-
screwed the clamping bolts take them off
and examine them for deformation. Lubri-
cate threads and heads thoroughly. Then
re-fit the bolts. If they don't turn easily you
will have to replace the bolts.
Adjust the front boom in a way that your leg
is fully extended when your heel (wearing flat
shoes) is in the foremost position on the
pedal. Experience shows that the pedal-to-
seat distance on a recumbent can be slightly
longer than on a conventional bicycle.
While you are pedalling, the ball of your foot
should be positioned above the centre of the
pedal axle.
It is important that your leg is not fully
straightened when the crank is in the fore-
most position. If the distance is too long it is
difficult to overcome this dead point, pedalling
becomes uncomfortable and there is too
much strain on the sinews of your feet and
legs. If the distance is too short you may suf-
fer from knee pain.
Caution! When you move the
front boom take care that its end does not
damage any light cables that possibly come
out of the main frame. Please inform your-
self about the length of the front boom on
your tricycle before you do any work.
While moving the front boom you also
have to move the light cables The light ca-
ble must never be stressed by pulling.
Adjust the front boon so that your knee will not be fully
straightened when pedalling.