5 hours ago, Enduro Spec said: They are more twin chamber than open or closed because of the separation between upper and lower chambers. I have raced these at speeds in Best in the Desert series last year and because of the huck system and speed sensitive design it works better than CC. Has small chop compliance at both high and low speeds. Deep stroke bottoming protection due to huck system. Has sub valve post design to hold the bike up under braking. This exact same fork is now my race bike enduro fork and I made only a 4 click adjustment to compression and nothing else. It's versatile as hell. Furthermore I won't make any changes this weekend for the Beta Riders of the Rockies ride in Sargents CO. If you're close, come ride the bike. I can't say that I could do all 3 disciplines with either of the stock CC or OC Sachs fork. Warren- The MXT website has a reference to a Subtank Upgrade to the Lucky cartridges . Can you explain these or are they simply not applicable to the Sachs kits?