use proper tools, supplies & kits · read all warnings · know oil volumes and inspection guidelines · know disc brake specifics for all Fox forks · know air shaft travel specifics for FLOAT and F-Series forks · use correct fork torque specifications

Changing FLOAT Air Spring Compression Ratio

Note:  Air spring volume spacers for FLOAT rear shocks are easily installed after releasing all air pressure and removing the shock air sleeve. The spacers offer a quick and easy means to adjust a rear shock's air spring compression ratio.

PN Description
803-00-612 Kit: FLOAT Air Spring Volume Tuning Kit: contains the three volume spacers shown below, plus a 5 ml packet of FOX Float Fluid (PN 025-03-002-A)


Rear Shock & Air Spacer Combinations to Avoid

WARNING:  DO NOT USE THE SPECIFIC COMBINATIONS OF SHOCK SIZING, TRAVEL, MODEL YEAR, AND AIR SLEEVE WITH THE VOLUME SPACER LISTED IN THE TABLE DIRECTLY BELOW. The resulting compression ratio with these combinations is beyond the bounds of product user safety. With a spike of excessive air pressure, the air sleeve can suddenly fail and cause a crash, property damage, SERIOUS INJURY, OR DEATH.


Size Travel Model Year Float Air Sleeve Volume Spacer
6.500 1.50 2005-2012 standard 0.6 in3, 0.685 Total Length
7.500 1.50 2005-2012 standard 0.6 in3, 0.685 Total Length
7.500 2.00 2005-2012 standard 0.4 in3, 0.346 Total Length
7.500 2.00 2005-2012 standard 0.6 in3, 0.685 Total Length
7.875 2.25 2005-2012 standard 0.4 in3, 0.346 Total Length
7.875 2.25 2005-2012 standard 0.6 in3, 0.685 Total Length

For a comprehensive list of possible air compression ratios with FOX shocks, see "Air Spring Spacer Compression Ratios (CR)" .

Installing FLOAT Air Spring Spacers

  1. Completely release the air from the shock.

  2. Clamp the shock in a soft-jawed vise. Unthread and remove the air sleeve, and wipe clean. Don't lose your sag indicator ring, if you have one.

  3. Using your fingertips, slide the bottom-out bumper and plate away from the eyelet assembly, towards the seal head.

  4. Insert the air volume spacer into the eyelet assembly.

    Note:  Be sure the counterbore face of the air spacer is facing up towards the seal head.

  5. Firmly press the air volume spacer into the eyelet assembly until it snaps into place.

  6. Slide the bottom-out bumper and plate down to the air volume spacer.

  7. Apply a light coat of slick honey grease to the air sleeve seal and its threads.

  8. After pushing the air sleeve onto its seal part way, add two (2) cc of float fluid.

  9. Pressing firmly, thread in and hand-tighten the air sleeve into the eyelet assembly.

Swapping Air Spring Spacers

Note:  Use the following procedure to switch from one air spacer to another.

  1. With the air sleeve removed, slide the bottom-out bumper and plate away from the eyelet assembly towards the seal head.

  2. Using a blunt-ended hand tool (a 4 mm hex key wrench works well), gently pry and remove the original air volume space from the eyelet assembly.

    CAUTION:  Do not use any sharp tools that might damage the air volume spacer, or other parts.

  3. Install the replacement air volume spacer, snapping it into the eyelet assembly.

     

  4. Slide the bottom-out bumper and plate down to the replacement air volume spacer, making sure the plate is evenly flush with the spacer.


  5. Return to step 7 in the "Installing FLOAT Air Spring Spacers" procedure, and continue to its completion.


use proper tools, supplies & kits · read all warnings · know oil volumes and inspection guidelines · know disc brake specifics for all Fox forks · know air shaft travel specifics for FLOAT and F-Series forks · use correct fork torque specifications