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Are there any alternatives?
I have to confess that I haven't directly measured an ERD since I stopped using tubulars nearly 30 years ago. Since the bead seat diameter of clincher rims is easily within 0.5mm of nominal, I just use a depth gauge to measure from bead seat to the desired end point of the spoke and subtract twice that value from the nominal BSD to get ERD. This method also completely eliminates the need to take multiple measurements and adjust for the rim being oval.
gbj_tester
@wenzovic
On the topic of ERD:
What is the best tool/way to measure it?
Right now I'm using two spokes cut to a specific length and joined together with an elastic band.
Pulling the spokes and the elastic band through the spoke holes multiple times per rim is kind of a pain though. If I use too much electric tape on the joint it doesn't fit through the spokes holes, not enough and it rips apart when pulling it through.
I've found a specific tool called "Rim Rods" made by Wheelsmith but it seems to be discontinued and only available from US online shops.
Are there any alternatives? Or does someone know where I can get the Rim Rods without ordering them from overseas?