Erm, I'm a newbie here, obviously, but I thought that most rim mfgrs make them left-handed -- the first hole ahead of the stem is biased toward the left flange. All the Mavics I have are this way, so far as I know. Weinmann concaves right-handed, Wolber Aspin right, but Alpine left. Sun CR18 right. Fiamme Ergal left. Velocity Synergy and Aerohead, can't tell that the spoke holes are biased at all.