@seraph: Progressive "trail" ,it appears to compress upward so front end wont move back under compression ,which simply makes your enduro more stable on decents while still feeling like a xc bike. Whoever built this should also make a more aggressive model us dh riders want them too! its not impossible to redesign so the shock is on the front to make it work on all frames. I have designed concepts alike this since highschool but only on paper and graphic. .