8
HP
Velotechnik
Sit down on your trike to find out the correct
front boom position.
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 ped-
al. Experience shows that the pedal-to-seat
distance on a recumbent can be slightly longer
than on a conventional bike.
While you are pedaling, the ball of your foot
should be positioned above the center of the
pedal axle.
It is important that your leg is not fully
straightened when the crank is in the foremost
position. If the distance is too long it is difficult
to overcome this dead point, pedaling be-
comes uncomfortable and there is too much
strain on the sinews of your feet and legs. If
the distance is too short you may suffer from
knee pain.
For riders with short leg length the front
boom has to be cut by a bicycle mechanic, so
it can be inserted maximum possible. It is im-
portant to trim the end of the tube neatly.The
bare metal of the shortened tube end has to
be protected against corrosion with a paint
stick or wax spray.
The maximum insertion of the front boom is
limited by possible heel strike of the frame’s
cross bar, depending on the rider’s shoe size.
Please check before riding your trike that
there is enough heel clearance. For shorter
riders under 175 cm body height we recom-
mend to use shorter cranks.
On the left underside of the front boom there
is a fine line.Align this line with the sticker on
the main tube’s front end right above the
clamping bolts to adjust the bottom bracket
axle to a horizontal position.Additionally, you
can 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 tricycle and check the
position.
Tighten the bolts with a torque wrench (tight-
ening torque 14–16 Nm). On your first ride
check whether there is sufficient clamping.
Adjusting the leg length
Adjust the front boon so that your knee will not be fully straight-
ened when pedaling.
Danger!
When you insert the front boom,
the front boom and the inner wall of the
tube must be totally free from grease, other-
wise it will not clamp properly and may turn
while you are riding.
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 yourself about the
length of the front boom on your trike be-
fore you do any work.While moving the
front boom you also have to move the light
cables The light cable must never be
stressed by pulling.
