Following the late Sheldon Brown's guide to measuring ERD of a rim, I came up with 624mm. That's 598mm nipple to nipple, 12mm per nipple, and 1mm per nipple washer. This is a very low profile Martano rim from the 70's, but I just wanted to check, does that sound like a possible number to come up with? At this low of profile, having a spoke more than 2mm too long would risk poking the tire. Thanks in advance.