The progressive suspension Air Tail shocks are a mix between air and spung shocks, this is compatiable with progressive suspensions compressor.
Until recently, air-adjustable suspension was a collection of compromises; the traditional air spring was never designed to perform the entire suspension function, and removing air to lower it made things even worse. Compromise does not sit well with us, so naturally we had to completely rethink air adjustable shocks. Not only did we utilize a traditional coil spring, but we’ve also inverted the customary function of the air chamber. What’s that mean to you? First off, it means that ADDING air pressure LOWERS the bike. All other Softail air suspension was instantly rendered obsolete. The addition of an on-board air compressor allows for instant and on-the-fly adjustment of both ride height and spring rate. The result is a perfectly tuned suspension, no matter the load or ride height.