As an additional tuning tool, the spring rate of the DBAIR can be adjusted through the use of air volume reduction spacers (included with the DBAIR). For bikes that have a more progressive leverage ratio.
Air volume is not the same as air pressure adjustment. Air pressure should be used to achieve the correct sag value. If the bike bottoms out harshly, or too frequently, reducing the air volume (using spacers) can provide a more progressive air spring. A more progressive spring will prevent harsh bottom-outs, since the spring will be “stiffer” as the bike gets closer to full travel.