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@Dom
Okay, so I've just received a pair of Rigida Sputnik rims and I need to order spokes. The manufacturer states an ERD of 600 but I want to measure them up myself.
Based on the Edd's instructions, I've taken measurements at six equal points around both rims like so:
On the first rim the value of X was always 584mm. On the second rim, the value of X was different each time but it averaged out to be 584mm.
I was using 12mm nipples so I've worked out the ERD to be 608mm based on the following:
584+(12×2)=608
Now, have I done this correctly? Should I use an ERD of 608 to calculate my spoke length and ignore the manufacturers stated ERD of 600?