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@rpm
Because they are offset, or "off centre" drillings. To allow for more even spoke tension between drive side and non drive side when using road hubs. (They are road rims).
I've just built a set of them for track, on large flange hubs. Using a 50mm 24h "rear" for the front and an 80mm 24h for the rear. Hopefully be able to test them tomorrow so will tell you if they explode and kill all of the things.
I've seen them used on other people's track bikes though so must be usable.