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Specialized Stumpjumper Manual

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8. AIR SHOCK SETUP
When setting suspension, always set the shock first and fork second for air pressure, rebound,
then compression.
Make sure you’re wearing all gear that would normally be worn on a ride (shoes, helmet, hydration
pack if used, etc.).
Sag is measured as the distance between the o-ring and the shock body’s seal, after the rider’s
weight has been applied to the bike, with no bounce. When the pressure is correctly set, sag should
measure approximately 25-30% of stroke, depending on rider experience/preference and terrain
conditions. If the rider is approaching 300lbs, sag may exceed the bike’s prescribed amount.
8.1. SETTING AIR PRESSURE
SEAL
SAG
METER
O-RING
1. Set the shock compression lever or knob (blue) to the full open or off
position, and set the rebound knob to the middle of the click range.
2. Attach a high-pressure shock pump to the air valve and increase the air
pressure.
3. Push the o-ring against the seal, then mount the bicycle while propped
up against a wall and sit in the saddle in a normal riding position, without
bouncing the suspension. Do not set sag while riding!
4. Check the sag by placing the Sag Meter against the rear shock shaft.
Once the sag is close to the desired setting, increase or decrease the
pressure as needed in 5psi increments until the desired sag is achieved.
To equalize the air pressure, cycle the shock or fork anytime after the air pressure has been adjusted.
CAUTION: Do not exceed the shock manufacturer’s maximum pressure (FOX: 350psi, RockShox:
325psi, X-Fusion: 250psi).
Please visit the suspension setup tool at www.specialized.com for personalized recommendations
for a baseline suspension setup based upon your specific height and weight.
8.2. ADJUSTING REBOUND
Rebound damping (red knob) controls the rate at which the shock returns after it has been compressed. Each rear
shock has a range of rebound clicks to fine-tune the rebound return rate.
Adjust the rebound based on the range provided in the suspension setup tool for your bike setup and rider
weight, as well as other factors like rider experience/preference and terrain conditions, then fine-tune during the
ride if necessary. If you do not have access to the suspension setup tool, start in the middle of the click range.
Clockwise for slower rebound (heavier riders, slow speed, bigger hits).
Counter-clockwise for faster rebound (lighter riders, higher speeds, small bumps, more traction).
It is best not to veer too far from the recommended clicks, since being too far out of the accepted
range can negatively impact the ride experience.
8.3. ADJUSTING COMPRESSION
Compression damping (blue knob) controls the amount of support of the shock platform. In other words, the
shock’s ability to resist low-speed pedaling forces while still being able to absorb high-speed compression forces.
Please refer to the suspension manual for specifics about the compression options provided by your suspension.
Typically, a suspension is equipped with some or all of the following settings:
OPEN: Low-speed compression setting optimized for the perfect balance of control and plushness for steep,
aggressive descents.
PEDAL: Moderate low-speed compression setting is activated for an optimal blend of pedaling efficiency and bike
control on variable terrain.
LOCK: The firmest low-speed compression setting is activated for maximum pedaling efficiency.
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