As I recall, the last time I had my rear wheel assembly off it was just about on the CG (or only very slightly ahead of the center stand). I had the bike on one these small HF lifts. Since the center stand has to be up prior to lifting the bike (to get the lift under the oil pan) it means the weight of the center stand is shifted aft. But even with that extra weight behind the center stand pivot the bike still had a tendency (with the rear wheel off) to want to rotate forward. But not by much. I had a buddy with me as a "guard".