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I use the Edd spoke calculator for normal stuff and the DT Swiss one for more offbeat stuff like straight pull hubs. Hub manufacturers are usually pretty accurate with their dimensions, rim manufacturers less so. I always measure just in case. I've yet to find a major discrepancy with hub dimensions (where they've been available) but rim ERDs have been a few mm off sometimes.
The Edd calculator has a database of dimensions, but it's very hit and miss and I don't trust it.
Brommers
TTM
Which is people’s go to online spoke length calculator?
And is it a bad idea to use the built in presets for hubs and rims? If so, is there a reliable database of things like ERD, Flange distance etc? Thanks