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3.3
SETTING YOUR SAG
The sag is the amount of travel used by your suspension from your weight on the bike. It is set by adjusting
the air pressure.
BOS recommends a sag percentage of 30 to 35 %, depending on your use and your riding style.
The bike manufacturer may also indicate a sag percentage. Please refer to your bike's user manual for this
value. If the manufacturer recommendation differs from ours, you should test the bike on the trail at
different sag values to find the right amount for your riding style.
How to measure and set your sag
Slide the travel checker O-ring up to the shock's dust seal.
Sit on your bike (if possible dressed with your riding outfit) feet on the pedals - horizontal position, and let
the suspension compress under your weight. Get off the bike without pushing on the suspension any more,
extend the rear suspension to its full travel by pulling up the saddle, and measure the distance between
the O-ring and the seal. This distance allows you to check the percentage of sag obtained with the current
air pressure.
To convert the distance into percentage, refer to the table below.
Length x travel (mm)
SAG (%)
Shock travel (mm)
If the sag is not correct, adjust the air pressure in 15 PSI steps. Equalize the air chambers after each
adjustment.
Too much SAG: Increase the air pressure.
Not enough SAG: Reduce the air pressure.
3.4
HYDRAULIC SETTINGS
The KIRK shock is a three-ways adjustable shock, which means there are three different damping
adjustments: rebound, low-speed compression, high-speed compression and a lock out lever that affects
low speed compression only. Your shock's base setting (internal) is set up for your bike's geometry when
you purchase the shock. We use three basic settings which cover the majority of bikes on the market.
The purpose of damping adjustments is to use all the shock's travel without bottoming-out (or only very
occasionally), to give rear wheel grip, but also to avoid the bike stalling out in holes, and finally to maintain
a good chassis position.
Below you will find the base settings for your shock, then it's up to you to analyze its performance on the
trail and tune the settings to suit your riding style. Do this carefully and methodically, step by step. Only
change one setting at a time and only by a few clicks. When it's done, note the setting and type of terrain.
If you get confused with the settings, return to the base settings and start again.
200x51
30
35
15
18
200x57
30
35
17
20
216x63
30
35
19
22
222x69
30
35
21
24
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