Bos KIRK 2014 User manual User Manual

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3.2. AIR CHAMBERS BALANCE

In order to guarantee a perfect functioning of your shock, after having set up the air pressure, you must proceed to
the air chambers balance.

The shock must be mounted on the bike.

Place the O’ring at 11 mm from the seal of the shock, sit on your bike, and push slowly on the suspension, to
compress the shock until the seal come onto the O’ring.Let the suspension extend itself, still slowly.
Repeat 15 times those up and down movements, always at low speed.

3.3. CHECKING THE SAG

The SAG is the quantity of travel used while sitting on your bike, due to the effect of your weight. It has to be set up
by adjusting slightly the air pressure.
BOS recommends a percentage of SAG of 30 to 35 %.
The bike manufaturer may also indicate a percentage of SAG. Please refer to your bike’s owner manual to check it.
If the bike percentage differs from Bos advices, please test on the track which is the best setting for your riding
style.

How to measure and set up the SAG ?
Slide the O’ring onto the seal of your shock.
Sit on your bike (if possible dressed with your riding outfit) feet on the pedals - horizontal position, and let the sus
pension compress under the effect of your weight. Get down from the bike, extend the rear suspension to the
maximum by pulling up the saddle, and measure the distance between the O’ring and the seal. This distance will
allow 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 stroke (mm)

200x51

200x57

216x63

222x69

SAG (%)

SAG (mm)

If the SAG is not correct, slightly set up the air pressure, by 15 PSI steps.

Too much SAG : increase the air pressure.
Not enough SAG: reduce the air pressure.

11mm

11 mm