7
6
SETTINGS
2.1 Air pressure
The first adjustment that should be done on the fork before riding is to set
the air pressure. This adjusts the s�ffness of the air spring according to
your weight. The s�ffness of the air spring induces a degree of fork travel
when you sit on your bike. This value, commonly called sag, can vary based
on your usage. Whatever your weight, it should be between 20% and 30%
of the total fork travel. As a reminder, SAG is measured by standing on the
pedals with arms and legs straight.
To achieve the best performance from your BOS product, it is important to
set your op�mal pressure.
The chart below will give you some base values
based on your weight. Your specific pressure may vary based on your
riding style and personal preference.
However, do not stray too far from
the indicated pressures, or you may risk changing the performance of your
fork.
Leisure use
Rider weight (Kg/Lbs)
60/132
65/143
70/154
75/165
80/176
85/187
90/198
95/209
100/220 105/231 110/242
Pressure (PSI)
137
151
164
177
190
203
217
230
243
256
270
Add an addi�onal 5 PSI per weight range for sports use.
It is recommended to use our BOS pump with digital pressure gauge for more accuracy and convenience, available
on our website.
Minimum opera�ng pressure : 115 PSI
Maximum opera�ng : 350 PSI
SETTINGS
2.2 Hydraulic adjustments
The Idylle 39 FCV has one rebound se�ng, two compression se�ngs (high and low-
speed)
and
a possible internal adjustment of the hydraulic stop.
The rebound se�ng
is adjusted via the screw on top of the right stanchion (1)
Remember to bleed your hydraulic cartridge regularly by unscrewing the
screw (2) to let out the internal air pressure generated by riding.
1
Valve cap
-
2
Air valve -
3
Air bleed scew
When bleeding the fork, do not compress it. The fork must be unloaded.
To start your adjustment, turn the adjuster all the way clockwise (clicks = 0). Clicks are then counted one at a �me
while turning the adjuster in the counter-clockwise direc�on.
The low-speed compression se�ng
is adjusted via the grey screw on the bo�om of
the right stanchion (1). It allows you to adjust the firmness of the fork during small
impacts by regula�ng the hydraulic flow
High speed compression
is adjusted by the red knob at the bo�om of the right
stanchion (2). It allows you to adjust the firmness of the fork during heavy shocks by
regula�ng the hydraulic flow.
Se�ng Ranges :
It is difficult to give a “magical solu�on” to hydraulic
se�ngs as these are linked to a number of different
parameters such as the influence of the rear suspension
se�ngs, the air spring pressure, the posi�on of the fork
in the crowns, and the geometry of the bike. This is not to
men�on personal rider preference. That being said, we
can offer the following general advice.
•
Frequent bo�om-out : harden high-speed
compression
•
Feeling of harshness on roots and rocks: so�en
high-speed compression
•
Discomfort, arms ge�ng sore: so�en low-speed
compression
•
Fork stays low over successive impacts and doesn’t
spring back: speed up rebound
•
Bike sits too high in travel: slow down rebound
•
Fork diving excessively on braking: harden low-
speed compression
It is worth considering other parameters that may be
influencing the performance of the fork, especially if you find
yourself very far from the base se�ngs. Change your se�ngs
in steps, only adjust one se�ng at a �me, and only open or
close the one se�ng by a few clicks at a �me. If you find
yourself lost in the se�ngs, reset to the base se�ngs and
start over again.
