2.5 Air Shocks 1-5/8" ShaftNitrogen Pressure:
Fox air shocks should be charged with NITROGEN ONLY. Nitrogen will not hold moisture, and expands less as temperatures increase. DO NOT fill your shocks with compressed air because this will introduce moisture to the shock causing internal corrosion.
Fox air shocks can be filled with 10psi to 500psi of Nitrogen. To calculate the spring force, multiply the PSI by 2.1 For example 200psi x 2.1 = 420 pounds of spring force. The nitrogen pressure is used to set the ride height.