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@Sanddancer
This doc though: https://sram-cdn-pull-zone-gsdesign.netdna-ssl.com/cdn/farfuture/WCzHvSxb0aZUSXFRjfVKUuFrq1Jx-YnUvXb8VgLuh4I/mtime:1488218564/sites/default/files/techdocs/gen0000000005175_rev_b_frame_fit_spec_2017_road.pdf
Lists the Omnium centreline to inner of chainring (bolt) as 42.5mm. God only knows.