I'm trying to determine the E.R.D on some rims, so that Joe Young can send me some spokes, and I can lace them up. They are off of a 75/76 Motobecane Grand Record. 27"/ 630mm, 22mm wide, red oval 'Super Champion' label. All the spoke calculators show 620 or 622 mm, depending on which model I have. To quote Joe, "I'm kinda particular about these things." Any assistance appreciated.
Arlington TX USA