AirFX Rear Air Ride mono-shock for Sport bike applications AirFX Sport Bike Rear Air Ride Kits are specifically designed to fit all mono shock rear applications. Now you can fine tune your suspension for extreme cornering and braking and quickly adjust back to a comfortable cruising mode. Experience fast responsive, grip and true performance with our sport bike kits, all in a package not any larger than your stock shock. The air in the shock reacts much faster than a standard hydraulic shock. By lowering your bike you will change the center of gravity and your geometry. This makes a huge difference in handling. Each shock has two air chambers for lift and 1 for rebound in axial alignment. Rebound is set by adding air to the Schrader valve on the shock, allowing the rider to adjust the ride height and rebound setting.