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@colm
the super zen chainrings do perform better than 75, but are 3 times the cost. its the special coating, not just the roundness. also each tooth is hand filed so that the square edge normally found on the 75 resembles the dura ace 7710.
as far as I know its ok for racers to do this themselves, some even do it to their cogs and have them chrome/nickel plated