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Are the ERD measurements quoted by manufacturers reliably accurate enough to order spokes or is it a ball park figure and you need to measure each rim just to be sure?
TIA
I usually measure them just to be sure, if I have the rim to hand.
If I'm ordering the rim and spokes at the same time I use the manufacturers ERD, and have had no problems (yet).
Some have strange ways of quoting ERD, Mavic for example.
If you compare the given figure with a couple of independent wheel building sites and all are the same it's fine.
Best to compare different calculators anyway to double check before ordering spokes.
Anyone else taken a punt without measuring?
Just measure them. Sometimes the sizes quoted can be way out.
