Suspension
56
HP
Velotechnik
Concept spring fork on Speedmachine
Shock boot
The dust boot is very important for the func-
tionality and the lasting of your fork. Unlike
many other suspension forks the CONCEPT
suspension system has a closed dust boot,
that means it also does not show any open-
ings for ventilation since the ventilation hap-
pens within the steerer tube into the clean air
inside the frame.
Please check the correct and sealed position
of the dust boot at the top and the bottom
before each ride. At the bottom the dust boot
shows a slot on the inside that has to fit the
washer above the fork crown. Also check the
condition of the dust boot. In no case may it
show any cracks or holes. If any dust or dirt
enters due to wrong assembly or damage the
wear of the bushings and the spline mecha-
nism increases considerably.
Changing the spring
If the spring stiffness does not meet your
needs you can order another spring with a
different stiffness from your dealer and have
him mount it.
You can distinguish the dismounted springs by
their color:
•
medium, 19 N/mm: red
•
hard, 24 N/mm, yellow
(Values valid for Concept-suspension from
10/2005 on.)
Attention!
The following assembly
instructions are for the bicycle mechanic:
You can exchange the springs from the bot-
tom of the fork.
Dismount the front wheel. If a mudguard is
mounted you will have to undo the screw at
the fork crown and remove the mudguard.
Clean the fork and the dust boot diligently.
Then remove the snap ring inside the lower
end of the steerer tube.
Please keep in mind that there is a slight
preload on the spring and that it comes out
quickly together with the lower spring sup-
port after you have removed the ring.
Remove the washer, the spacer and the lower
spring support. The upper spring support and
the plastic tube that surrounds the coil spring
might come out, too.
Change the spring and attach the lower spring
supports. Push the plastic tube back over the
spring.
Then put the whole package back into the
steerer tube. Spacers that may come with the
spare spring have to be mounted below the
spring.
The spacer has a hole for the screw of the
mudguard. Align the hole in the spacer with
the thread on the back of the fork crown and
push the spacer in the steerer tube.
The upper spring support has to click in no-
ticeably on the lower end of the piston rod in
the steerer tube so that there is only a 3 mm
preload of the spring necessary to put back
the safety ring in its position in the slot in the
steerer tube.
Attention!
In any case either the
spring support or a spacer has to be di-
rectly over the safety ring, never the spring
itself.
In order to check whether the safety ring is
correctly seated in its slot take a screwdriver
and push slightly on the ring, it must not move
then.
Before taking a first test ride always check
whether all parts have been mounted correct-
ly and the fork works smoothly by pushing
several times on the frame of the parked
bicycle.