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@colm
I just noticed today that theres noticeable change in tension with my set up when I have the chain tight, Ive not seen it before with normal tension.
anyway I tried different size chainrings, DA 7710 with an old and new HKK vertex chain, it was the same for each combination. binding for a quarter turn and loose for the rest of the rotation.
on the international scene I dont think Ive seen Omniums used, only 7710/SRM/Sugino 75 super/grand mighty, is this because the Omniums are not prefectly centred?
its annoying since Ive just invested in a full set of 7710 chainrings, and 2 sets of omniums. thinking about sugino grand mighty for next season, the square taper doesnt deform as much with them and they are rounder than 75's at not much extra cost.
other than that the stiffness and standard gxp bearings have been great