fbr@utastro.UUCP (Frank Ray) (05/11/84)
Air shocks contain a certain amount of oil in addition to the air volume, hence are more properly called air-hydraulic. The spring rate is dependent on the volume of air, which can of course be adjusted by changing the amount of oil. The beauty of air shocks is that their initial pressure may be easily changed to suit varying loads. Where they really come in handy is in utilitarian vehicles which ride around empty most of the time but are called on to carry sumaru stones to the little woman's new Japanese garden project on weekends. They also work on touring motorcycles whose load can vary 100%. Oil can be added with a mechanic's syringe through the air entry hole.