Base settings (regardless of internal shock setting):
Please refer to the chartlist available to download at bosmtb.com for specific pressure and setting suggestions for your bike and
weight.
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 strok. 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 bikes 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 chassis balance high. 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. The
installation procedure can be found on the following page.
Low-speed compression: 15 clicks from the fully closed position
High-speed compression: 12 clicks from the fully closed position
Rebound: 12 clicks from the fully closed position
ATTENTION
BOS has worked hard to develop our compression curve, which allows the KIRK shock to maintain the balance of the bike,
as well as giving good response, and improving handling. BOS recommends setting up the bike with a fast rebound to
keep the chassis balanced, and avoid the bike sitting low in its travel. This will make the bike less nervous, and more
comfortable.
The feeling of «fast» or «slow» rebound will differ from one rider to another. Thus it’s difficult to define it precisely. We
advise you to define your own range of correct rebound - the range of settings between «too fast» and «too slow». Then,
always choose a setting in the faster part of that range, for example the three last clicks (counterclockwise) on a range of
nine.
Only use O-rings provided by BOS. The dimensions and the material are specifically chosen for this purpose.
WARNING
IMPORTANT
To start your adjustment, turn the knob clockwise until it stops (clicks = 0). Then count the clicks while turning the knob in
the counterclockwise direction.
