Rim Diameters (ERD)

Effective Rim Diameter (ERD) is used to calculate spoke length when preparing to build a wheel. The measurements here are averages based on two measurements (90 degrees apart) of two rims of each type and different hole counts. These are provided as a guide only. Actual required spoke length could vary slightly from those calculated.

  • Model 101 700c 30mm toroidal Al rim = 576.3mm
  • Model 245 650c smooth Mid-v Tubular = 521mm
  • Model 250 25mm deep, (red) Quick-V tubular = 596mm
  • Model 255 700c 32mm deep, dimpled Mid-V tubular = 575mm
  • Model X32 700c 32mm deep 202 Firecrest Carbon Clincher = 580mm
  • Model 280 700c 38mm smooth Mid-v Tubular = 569mm
  • Model 285v4 700c 45mm deep Mid-v Tubular = 555mm
  • Model X45/285 700c 45mm deep 303 Firecrest Carbon Clincher = 552mm
  • Model X58/360F 700c 58mm deep 404 Firecrest Carbon Clincher = 528mm
  • Model 330 650c 58mm deep, smooth Deep Tubular = 484mm
  • Model 360 700c 58mm deep, smooth Deep Tubular = 525mm
  • Model 360 700c 58mm deep, dimpled Deep Tubular = 525mm
  • Model 360v3 Tubular Firecrest = 525mm
  • Model 370 650c smooth Mid-v Clincher = 518mm
  • Model 415 700c 38mm deep, smooth mid-v Clincher = 569mm
  • Model 417 700c 44mm deep, dimpled mid-v Clincher = 551mm
  • Model 420 700c 82mm deep, dimpled Super Deep Tubular = 483mm
  • Model 420v4 Tubular Firecrest = 483mm
  • Model 460 650c 58mm deep, smooth Deep Clincher = 480mm
  • Model 505 700c 58mm deep, smooth Deep Clincher = 529mm
  • Model 505 700c 58mm deep, dimpled Deep clincher = 530mm
  • Model 520 700c 82mm deep, dimpled Super Deep Clincher = 477mm
  • Model X82/420F 700c 82mm deep 808 Firecrest Carbon Clincher = 483mm
  • Model 620 700c 108mm deep, dimpled, Extra Deep Tubular = 421mm
  • 720 700c 108mm deep, dimpled, Extra Deep Clincher = 423mm
  • CSC aluminum rim = 596mm
  • Zipp 30 700c 30mm deep hyper toroidal aluminum rim = 576mm
  • Zipp 60 700c 58mm deep Carbon/Al dimpled clincher rim = 530mm

MY13 spoke lengths [xls]