I run 8lbs when solo , the stiffer ride seems to improve the handling in the curves IMO , riding 2 up with tour luggage I run around 25lbs and everything feels good . I like to keep a little air in the shocks at all times it just seems that 2 or 3 lbs of air minimum would be better for the shocks then no air at all IMO . You don't need allot of air in the shocks when solo because the riders weight is more centered on the bike so the load is more evenly distributed . I have the touring suspension air pump HD part #54630-03A ($49.95) and it is a great investment IMO , I carry it on the bike all the time so I can make a adjustment whenever needed .