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10.2. Brain fork components and tuning information
1
A
B
3
2
C
RockShox forks can be tuned for your particular weight, riding style, and
the terrain. When tuning your fork, always do so in the following order:
1. Sag (spring rate tuning)
2. Brain Fade adjuster (blue lever) - Turn clockwise for firm and
counterclockwise for soft.
3. Rebound damping adjuster (red knob) - Turn clockwise for slow and
counterclockwise for fast.
To equalize the air pressure, cycle the fork anytime after the air
pressure has been adjusted.
10.3. Setting sag and air pressure
Sag is the amount the fork compresses from your weight and riding gear
when sitting on the bicycle. Proper sag adjustment enhances the ability of
the front wheel to follow the contour of the terrain as you ride.
Measuring sag
To measure sag, verify that the Specialized Brain is open by turning the
blue knob (2) counterclockwise.
Move the travel indicator O-ring (A) down against the wiper seal of the
fork’s upper tube (B).
Sit on the bicycle wearing all of the gear you would normally wear
on a ride. Step off the bicycle and measure the distance between the
O-ring and wiper seal (or, if applicable, check the location of the travel
indicator O-ring against the sag value gradients marked on the upper
tube). The measurement is your sag level and should be between 15%-
25% of maximum travel.
If you’re unable to achieve proper sag, you may need to change the
fork’s air pressure (see “Air spring tuning” below).
Air spring tuning
Solo Air forks have an adjustable positive air chamber. Air pressure
determines the amount of force required to compress your fork.
More air pressure results in less suspension sag and increases the
force required to bottom out the fork. Less air pressure results in more
suspension sag and reduces the force required to bottom out the fork.
To set the air pressure, remove the air cap on the air valve (C).
Refer to the chart on the fork leg or in section 11.1 for recommended
air pressure settings. These air pressure settings are intended as a
guideline only. Inflate the air chamber to the desired pressure and then
adjust according to the riding style and terrain.
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