Our AIR/AIR-A shocks, we designed to have easy adjustability that performs great in every situation. One of the things that we’ve done to achieve this and offer an unsurpassed ride quality is we use an Aramid Fiber air spring technology. This allows the shocks to have a wide range of adjustability and to be very compliant throughout the range of travel. Air springs maximize wheel travel and adjust to any desired ride height. These systems come complete with a handlebar-mounted control for easy "on-the-go" adjustability resulting in the rider being able to fine-tune the suspension at all times.
The only difference between the two kits is that the AIR-A offers a little more adjustability in the form of a six-position rebound adjustment knob on the lower damper body of each shock that allows you to adjust rebound, (or how fast the shocks return to their fully extended length after being compressed). The rebound adjustment option on the AIR-A is just an added adjustment feature that allows a rider to fine-tune their ride quality.