2019-2020 FLOAT X2 Air Spring Tuning with Volume Spacers

Changing volume spacers in the 2019 FLOAT X2 shock is an 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 a larger spacer to increase bottom out resistance. 
  • If you have set your sag correctly and are not using full travel, then you could install a smaller spacer to decrease bottom out resistance.


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Shock Size Maximum Spacer Pair Quantity
7.875 x 2.000 2
7.875 x 2.250 2
8.5 x 2.25 (Enduro) 4
8.500 x 2.500 3
8.750 x 2.750 3
9.500 x 3.000 4
10.500 x 3.500 5
185, 50 2
185, 55 2
205, 60 3
205, 62.5 3
205, 65 3
210, 50 4
210, 55 4
225, 70 4
225, 75 4
230, 57.5 5
230, 60 5
230, 65 5
250, 70 6
250, 75 6


  • FLOAT X2 Volume Spacer pairs have a volume of 0.25in³.
  • 803-01-139: Kit: Volume Spacers, 3 Pairs: Float X2, Clip-in, Plastic, 0.25in 3


The video below guides you through the installation and removal of FLOAT X2 Volume Spacer pairs.



Using the EVOL Air Sleeve

The EVOL air sleeve is standard on FLOAT X2 shocks. The EVOL air sleeve provides an external negative air chamber added to the main air sleeve to significantly reduce the force to initiate travel, providing excellent small bump performance. The system is also more linear in its progression offering improved mid stroke support and better bottom out resistance. It is important to add or remove air from the EVOL sleeve as detailed below to experience the best possible performance.


When adding air to the air chamber, it is important to equalize the positive and negative air chambers by slowly compressing the shock through 25% of its travel 10-20 times after every 50psi addition.

  • Adding air to the shock without periodically equalizing the air chambers can lead to a condition in which the shock has more pressure in the positive chamber than the negative. In this condition the shock will be very stiff and can top-out. You can equalize the air chambers by slowly compressing the shock until you feel and hear a transfer of air. Hold the shock at this point for a few seconds to allow the air to transfer from the positive to the negative chamber.


When releasing air from the air chamber, it is important to do this slowly so the shock can transfer air from the negative to positive chamber and then be realeased through the Schrader valve. 

  • Releasing the air pressure too quickly can induce a condition in which the negative chamber has more pressure than the positive chamber. In this condition the shock will compress into its travel and not fully extend. You can remedy this by adding air pressure until the shock extends, then slowly compressing the shock through 25% of its travel 10-20 times.

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 shock 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.

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