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3.5
AJUSTING AIR VOLUME
The progressivity adjustment featured on the KIRK, allows you to adjust the air spring rate on the last third
of stroke. Thus, if you have found satisfying settings (air pressure and hydraulic) on the first half of the
stroke, you can adjust the feel of the last millimeters of travel.
The most frequent and simplest cases are:
The shock has an overall setup to single out comfort and grip, and the bike sits low: by increasing the end-
stroke rate you will get a better control of the chassis through the shock and avoid bottoming out. The rate
curve should be more progressive (increasing at the end) by adding o-rings.
The overall setup of the shock is more responsive, with a high chassis balance. By decreasing the end
stroke rate by removing o-rings, you can make sure that you use all the travel.
This setting is adjusted by adding or removing O-rings placed inside the air can.
We suggest you to go about the set-up step by step. First add or remove two O-rings, then fine-tune the
setting with one O-ring at a time. Adding one O-ring in the chamber increases the end of stroke spring rate
by 2%.
Usually, the correct setting is between 0 and 4 O-rings. However, the range can go up to 10 O-rings
depending on the bike
Caution :
Only use O-rings provided by BOS. The dimensions and the material are specifically chosen for this
purpose.
Procedure
Place the head of the shock in a soft-jawed
vice (figure 1).
Caution :
Before tightening the vice, make sure the
jaws grip a flat surface and are not
touching the rebound knob.
Lightly tighten the vice jaws to prevent
damaging the shock.
Note your shock pressure, taking into
account
the
loss
connecting your pump. Slowly deflate the
shock. The shock body will retract slightly.
Unscrew the air can (a) while keeping the
body (b) in its initial position (figure 2).
of
pressure
when
1
3
2
a
4
b
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