To my hamfisted mind, that introduces a lot more opportunity to get the measurement wrong. I suppose I could tie them together with laggy bands, but still…
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It works though. I have 2x 250mm spokes just for that task to make the maths easy.
I just take the manufacturer’s word for it, I reckon they’re better at measuring than I am.
They’re often not, I’ve no idea why they’re incapable of getting it right, but they are, they’ll quote nipple seat diameter, rim diameter, anything except the sodding ERD.
At least nowadays you can look on google and someone on a forum somewhere will have measured the correct number.