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TECHNICAL SPECIFICATIONS
BOS KIRK SUSPENSION SET-UP
SETTING SAG BY ADJUSTING THE AIR SPRING
Sag is the measurement of how much the suspension
compresses (or sags) under body weight. Orbea re-
commends between 27-33% (17-21MM) for the Ra-
llon R4. Less sag will give a firmer ride that climbs
and pedals more efficiently, more sag will make the
suspension softer and more bump-sensitive, giving
more control at high speeds in rough terrain.
You will need a shock pump to adjust sag via the air
spring valve. Make sure the Pedal Efficiency Lever
is OFF. Ensure that the o-ring on the shock shaft is
pushed all the way up against the shock body and
mount your bike with your riding gear on (to mimic ri-
ding weight). It might be handy to lean the handlebar
against a wall for balance, or have a friend help you
hold the bike. Without bouncing, sit on the saddle and
lift your feet off the ground so the shock compresses.
If you feel like you've bounced and pushed the ring
too far, put the o-ring back against the shock body
and try again. Gently get off your bike. The distance
the o-ring traveled from the shock body is the sag
measurement. With your shock pump, either increase
or decrease pressure in the air spring to reach the
desired measurement. Remove the shock pump from
the shock each time before re-checking sag.
( 17-21MM )
SETTING HIGH-SPEED COMPRESSION (HSC)
High-speed compression damping (red knob) controls
how your suspension compresses under quick, high
impact forces such as square edge hits and harsh
landings. Impacts that cause your suspension to com-
press deeply and rapidly will generally be controlled
with the HSC setting.
Start at the midpoint (12 clicks) and adjust HSC to
achieve a balance between effectively using travel and
bottoming out.
SETTING REBOUND
The opposite of compression damping, rebound dam-
ping (black knob) controls how quickly the shock ex-
tends to stabilize the bike and manage traction. Too
much rebound damping will make the rear end feel
stiff and cause the rear tire to skip over chatter. Too
little will cause the suspension to bounce back too
rapidly and compromise control.
Start at the midpoint (12 clicks) and adjust rebound to
achieve a balance between quick, plush recovery and
stability after larger impacts.
SETTING LOW-SPEED COMPRESSION (LSC)
Low-speed compression (grey knob) controls shock
sensitivity - cornering traction and bike stabilization
under braking forces or weight shifts. Brake dive and
pedal "bob" are tuned out by adding more LSC at the
expense of losing plushness and traction.
Start at the midpoint (12 clicks) and adjust LSC to
achieve a balance between sensitivity over small
bumps and a bike that remains stable under braking
forces or weight shifts.
USING THE PEDAL EFFICIENCY LEVER
Low-speed compression (grey knob) controls shock
sensitivity - cornering traction and bike stabilization
under braking forces or weight shifts. Brake dive and
pedal "bob" are tuned out by adding more LSC at the
expense of losing plushness and traction.
Start at the midpoint (12 clicks) and adjust LSC to
achieve a balance between sensitivity over small
bumps and a bike that remains stable under braking
forces or weight shifts.
OFF
ON
12
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