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@Sanddancer
I assumed that the distance to the inside of the ring must be a way off, or taken with a pinch of salt, when thinking about chainline purely because the W3 number for the Omniums is 37mm for a chainline of 42mm. But I don't know if you could add 5mm to the rest of the listed figures and be confident in having an accurate chainline.
I never thought it would be so difficult to get this working.
I know that the X-Sync technology isn't necessary, but I did think that a track/SS specific chainring would be a good idea running fixed/free. They still have tall teeth, right? Would you be comfortable running fixed gear using a stock 46t Force cross ring?