Joined: Jun 2009
Posts: 2,242
Likes: 1,659
From: PacNW
Bikes: Dinucci Allez 2.0, Richard Sachs, Alex Singer, Serotta, Masi GC, Raleigh Pro Mk.1, Hetchins, etc
@OP you are getting some great info here but there's no substitute for actually measuring the ERD.
You can do it with 2 spokes in oppositional spoke holes.
/markp