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Rim Rods are still the most practical way to calculate ERD (Effective Rim Diameter). We (Wheelsmith) introduced the first many decades ago. Today, the best set you can find is by BSC.
They are recommended on Cycling Tips here. We offer two sets:
700mm pair—2 rods, one marked from 700mm to 400mm—for 700c, 650c, and 26".
