I would like to see your zero width 2D hub. Aren't you measuring in the plain of the rim instead of the hypotenuse from the spoke holes of the hub which will be displaced by some of the width of the hub?
Aren't you measuring in the plain of the rim
ERD is correctly measured in the plane of the rim. Correcting for the hypotenuse is done in spoke calculation afterwards.
@gbj_tester started
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I would like to see your zero width 2D hub. Aren't you measuring in the plain of the rim instead of the hypotenuse from the spoke holes of the hub which will be displaced by some of the width of the hub?