F90X/F110X/F120x/f130X

Installing Your Fork  |  Before You Ride  |  Setting Sag |  Adjusting Rebound  |  Adjusting Bump Threshold  |  Service Intervals  |  Important Safety Information

Installing Your Fork

Be sure your fork is properly installed before proceeding. Clicking on the link above will take you to a new page.

Before You Ride

1. Check that quick-release levers are properly adjusted and tightened.

2. Clean the outside of your fork with soap and water and wipe dry with a soft dry rag. Do not spray water directly on the seal/upper tube junction. Do not use a high pressure washer on your fork.

3. Inspect entire exterior of fork for damage. The fork should not be used if any of the exterior parts appear to be damaged. Please contact your local dealer or FOX Racing Shox for further inspection and repair.

4. Check headset adjustment. Adjust headset if loose, according to manufacturer’s recommendations.

5. Check that brake cables or hoses are properly fastened.

6. Check that the front and rear brakes operate properly on flat land.

Setting Sag

You can also view a Flash video on Setting Sag.

To get the best performance from your fork, it is necessary to set and adjust sag. Generally, sag should be set to 15 – 25% of total fork travel.

1. Unscrew the blue aircap (shown below) on top of the left fork leg to expose the Schrader valve.  

2. Attach a FOX Racing Shox High Pressure Pump to the Schrader valve.

3. Using the Air Spring Settings table below, pump your FLOAT fork to the appropriate setting using the FOX High Pressure Pump, then remove the pump.

4. Install a zip tie with light friction on the upper tube and push it down until it contacts the fork seal.

5. Carefully sit on the bike and assume a normal riding position. The fork should compress slightly.

6. Being careful not to further compress the fork, dismount the bicycle. Measure the distance between the seal and the zip tie. This distance is sag.

7. Compare your sag measurement to the Sag Setup table below.
   
   If your sag is lower than on the table, screw on the pump fitting, note the current air pressure setting and depress the black bleed-valve to reduce the gauge pressure by 5 psi. Measure sag again and repeat adjustment, if necessary.
   
   If your sag is higher than on the table, screw on the pump fitting, note the current air pressure setting and pump to increase the gauge pressure by 5 psi. Measure sag again and repeat adjustment if necessary.

8. Screw the blue aircap back on, and go ride.

Adjusting Rebound

The rebound knob (shown below) is located on the top of the right fork leg, and has 12 clicks of adjustment. Rebound controls the speed at which the fork extends after compressing. Turning the knob clockwise slows down rebound; turning the knob counterclockwise speeds up rebound. As a starting point, turn the rebound adjuster knob all the way clockwise (full in) until it stops, then turn counterclockwise (out) 6 clicks.

Adjusting Bump Threshold

Bump threshold is adjusted with the blue knob located on the bottom of the right fork leg. This gives the rider the ability to adjust the force required to cause the BrassMass valve to open, depending on the bump input from the trail. Turn the knob clockwise to make it harder for the BrassMass valve to open (higher bump threshold), counterclockwise to make it easier for the BrassMass valve to open (lower bump threshold).

There are 22 clicks of adjustment. The factory setting is full out (counterclockwise), then 6 clicks in (clockwise).

eng074