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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.
Loosen the bolts to adjust the front boom.
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.
Attention!
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 pe-
dal. 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.
Danger!
When you insert the
front boom, the front boom and the inner
wall of the tube must be totally free from
grease, otherwise it will not clamp proper-
ly and may turn while you are riding. This
can result in serious accidents.
Adjust the front boom so that your knee will not be fully
straightened when pedalling.
