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chainline itself (which it doesn't give)
I'm never quite sure whether it does or not. The dimension looks like it's to the inner face of the teeth as it's drawn, but the numbers seem more consistent with being the centreline. If you're using derailleur chain, it's close enough. You don't need an XSync ring for fixed/SS, since the chain is neither flapping around nor approaching the ring from an angle.
gbj_tester
Thank you. I can't tell you how many times I've looked at that pdf over the last week. But that was when I was worrying about chainline itself (which it doesn't give), not relative positions of ring mounts.