Just serviced the DHX 4 air on my 06 Enduro. currently no air in it. Fox manuals and web stuff is half helpful but a touch vague. I translate them as follows. 1. Measure full travel of shock which if done with no air gives the full length. 2. Stick some air in and keep adjusting until sag with me on board, stationary, equals recommended amount. Anyone got any rough amounts to start with. My weight is about 13 stone and I am looking to set it up for fairly downhilly riding, so say about 30% sag. Any opinions etc much appreciated. eg the travel length of the shock as the length in the book is not given.