The 1.5 km long double black trail from the top of the Gray Montain. Described: "EXPERST-ONLY downhill MTB adrenaline rush or challenging hike, with very steep grades and exposure along limestone outcrops and slabs." From my experience in principle everything mobile except a few really steep and really long steep ramps. This is really only for Adreanline junkies. This view in the second part on a plateau is fantastic