• I forgot to mention that I do use a rubber band. I didn't find it that complicated. You've got two spokes (of any length) held in tension across a rim. You measure across them to the ends of the nipples. Then you measure a nipple and add that (x2) to the total spoke distance. I repeat twice more to account for a rim being out of round. It maybe takes 10 mins max for two rims. If you're feeling lucky, you can assume that your rims have an identical ERD and are sufficiently round to warrant one measurement.

  • you can assume

    Until you learn that assuming things leads to problems when wheelbuilding. I measured a rim the other day that had >2mm ERD discrepancy around the rim

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