Measure yourself or take what the manufacturer says?
ERD rim measurement
Both, and see if they agree.
Or c, what I do, give it to the nice wheel buildy man and let him work it out
I always measure it. Why wouldn't you?
I've always needed to take the manufacturer's measurements at face value as I've ordered rims and spokes at the same time. It's always made me nervous but I've not had a major problem.
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