Located on the top of the reservoir can is the dual-speed compression adjustment control. With a flat head screwdriver you can adjust the low-speed compression one to 24 clicks. With an 18mm socket you can adjust the high-speed compression. The ability to control both speeds assures you a level of ride adjustability not found on many competitor systems. If you head on over to www.foxracingshox.com there are some really great aids and graphs that will teach you more about fine tuning your shocks and how valving works. Take your time and try out all the settings until you discover what works for you.