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UB200|UB400|UB600|F30 Suspension Forks:
http://dump.antropoide.net/pub/trek/om/asse
ts/pdfs/10rst_forks_engdefi.pdf
https://d.docs.live.net/78f9216d35fd6af3/Doc
uments/RST-FORK-USER-MANUAL-1.pdf
M300|M500 Suspension Forks:
Also observe the suspension glossary at the
beginning of this chapter.
ADJUSTING THE SPRING RATE
To work perfectly, the suspension fork must be
adjusted to the weight of the rider, the sitting
posture and the intended use. If you wish to
have this adjustment carried out; contact your
bicycle mechanic.
Note in general that the suspension fork must
give in a little even when you are just sitting on
the bike; this is the so-called negative
suspension travel or sag. If you ride over a
pothole the spring is decompressed and the
suspension fork compensates for the
unevenness. If the air pressure or the spring
preload is too high, this effect is lost because
the suspension fork is already fully extended.
This means that an important comfort and
safety factor is lost if the tyre briefly loses
contact with the ground.
The suspension fork should yield by 10-25 % of
the maximum suspension travel.
To measure the travel, you can use the rubber
ring mainly located on the thinner, plunging
tube of the suspension fork. If there is no
rubber ring, tie up a cable tie around one of the
stanchion tubes. Make sure it is not too tight,
you should still be able to move it, it should
however not slip by itself.
Put on your usual riding clothing (including if
necessary, a packed backpack), sit on your bike
and bring yourself into the usual riding
position. Lean against a fixed object (railings,
wall etc.) and make sure you do not fall over.
Ask a helper to move the rubber ring or the
cable tie downwards against the dust seal at
the lower leg.
Get off your bike so that the fork does not
compress anymore. The distance between the
rubber ring/cable tie and the wiper is the
negative suspension travel, or sag. Compare it
against the total suspension travel (as specified
by the manufacturer) to determine whether
the suspension should be set to be harder or
softer.
With air suspension forks the spring rate is set
by the air pressure in the fork. The pressure
must be set before the first ride by means of a
special high-pressure pump with pressure
Summary of Contents for UB200
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