Beringer Brake Rotors feature a billet aluminum hub with directional design spokes and must be ordered as Right or Left rotation rotor.  Super Moto and some road bikes hubs are flat.  Some road bikes feature offset or dished hubs which are more costly due to the extra material and machining time involved in their manufacture.  The tips of the hub spokes are stagger cut to free up the floaters and allow the rotors to float even under brake load.  Racing rotors feature Beringer's traditional, well proven and warp-proof, smooth cast iron braking track.