a tunable air spring / shock absorber comprises a cylinder , a piston rod extending out of the cylinder through a lower end thereof , and rod guide provided on the lower end of the cylinder for guiding the piston rod , a seal mounted on the rod guide and piston containing valving components to deliver desired force - velocity characteristics for rebound and compression mounted on the piston rod . the piston is submerged in oil during the complete stroke of the air spring / shock absorber . on top of the piston , a spacer is provided which separates a sealing disk or piston that hermetically separates a counter spring chamber and a main spring chamber . the tunable air spring / shock absorber has an upper closure on the cylinder with a valve that allows pressurization of the main spring chamber .