I’ve used DualAir Rebas and Revelations a lot. The recommended air pressures were always a bit high IME. Best to just set it by trial and error. Release all the air from the negative chamber (at the bottom). Set the positive chamber (in PSI) to 60% of your weight in pounds (including all your riding gear). Set the compression and rebound damping to the middle of the range. Find something similar to the biggest drop you regularly ride and ride over it. You want the fork to use most of its travel without bottoming out harshly. If it blows through the travel, bump up the pressure in 5 PSI increments until it has enough end stroke support. Once you have that, set the negative chamber to the same pressure and try some gentle XC type trails. You want enough sag that the fork is supple over small stuff. If it has too much sag, reduce the negative pressure until it feels right. That should get you in the ballpark. After that, it’s a matter of making small adjustments until you find a good balance of damping and air pressure. Takes a while to get it tuned, but the DualAir forks are very tunable by experimenting with the positive and negative pressures.
