2016 40mm FLOAT Air Spring Tuning with Air Volume Spacers

Required Tools

WARNING: Always wear safety glasses and protective gloves during service to prevent potential injury. Failure to wear protective equipment during service may lead to SERIOUS INJURY OR DEATH.

Changing volume spacers in the 40 FLOAT fork is an easy internal adjustment that allows you to change the amount of mid stroke and bottom out resistance.

  • If you have set your sag correctly and are using full travel (bottoming out) too easily, then you could install one or more spacers to increase bottom out resistance.

  • If you have set your sag correctly and are not using full travel, then you could remove one or more spacers to decrease bottom out resistance.






  • 40mm FLOAT volume spacer PN: 234-04-726 is red and has a volume of 10cc

 40 NA2 topcap with spacers .75 veiwa.jpg

The following instructions guide you through the removal or installation of the FLOAT volume spacers.

WARNING: FOX products should be serviced by a trained bicycle service technician, in accordance with FOX specifications. If you have any doubt whether or not you can properly service your FOX product, then DO NOT attempt it. Improperly serviced products can fail, causing the rider to lose control resulting in SERIOUS INJURY OR DEATH.

WARNING: Never attempt to modify air volume spacers, as this can damage your fork causing a loss of control of the bicycle leading to SERIOUS INJURY or DEATH.

WARNING: FOX suspension products contain pressurized nitrogen, air, oil, or all 3. Suspension misuse can cause property damage, SERIOUS INJURY OR DEATH. DO NOT puncture, incinerate or crush any portion of a FOX suspension product. DO NOT attempt to disassemble any portion of a FOX suspension product, unless expressly instructed to do so by the applicable FOX technical documentation, and then ONLY while strictly adhering to all FOX instructions and warnings in that instance.

WARNING: Modification, improper service, or use of aftermarket replacement parts with FOX forks and shocks may cause the product to malfunction, resulting in SERIOUS INJURY OR DEATH. DO NOT modify any part of a fork or shock, including the fork brace (lower leg cross brace), crown, steerer, upper and lower leg tubes, or internal parts, except as instructed herein. Any unauthorized modification may void the warranty, and may cause failure or the fork or shock, resulting in SERIOUS INJURY OR DEATH.


Step 1

Remove the blue air cap and cover the air valve with a rag as you release the air pressure.


WARNING: Please verify that all air has been released from the air chamber by pushing down on the Schrader valve core. Failure to release all air pressure before further disassembly may cause parts to eject causing SEVERE INJURY OR DEATH.


Step 2

Loosen the 5mm hex bolt (counter-clockwise) on the air side of the upper crown. With a chamfer-less 6-point 32mm socket, unthread the topcap assembly completely. Pull straight up to remove the entire topcap assembly from the left side stanchion tube. Some upward force might be needed to overcome the friction of the stock air volume spacers.



Step 3

Slide the air volume spacer or spacers horizontally to install or remove from the topcap. 


WARNING: DO NOT exceed the maximum number or volume spacers listed in the tables below, as this can damage your fork causing a loss of control of the bicycle leading to SERIOUS INJURY or DEATH. 



Step 4

Reinstall the topcap into the fork crown and tighten clockwise to 220 in-lb (24.8 Nm) torque with your 6-point chamfer-less 32mm socket. Tighten (clockwise) the 5mm hex bolt on the air side of the upper crown to 65 in-lb (7.34 Nm).



Step 5

Add air pressure to your desired setting using a FOX high pressure pump. See the Setting Fork Air Pressure section for more information. Reinstall the blue air cap then go ride!


Distributor and OEM service documents access


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