Shimano has two people editing their document - and they don't communicate with each other:
1. The one doing most of the edits measures to the outside of the flange - not the flange center as most people do. So you'll have to subtract 1.6mm for each flange offset in rough terms to get the "flange center" oriented value. Standard alloy hub flanges are 3.2mm thickness. Campy does the same thing...
They do get hole-to-hole diameters correct - however there are two disc hubs in the Shimano document that are erroneous. I come back again to post those...
2. The other person who does minor edits measures to center of flange correctly - and like the major editor gets the hole-to-hole diameters correct.
=8-)
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life