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 250 700c Quick-v Tubular = 596mm
• Model 245 650c smooth Mid-v Tubular = 521mm
• Model 280 700c smooth Mid-v Tubular = 569mm
• Model 285 700c dimpled Mid-v Tubular = 557mm
• Model 370 650c smooth Mid-v Clincher = 518mm
• Model 330 650c smooth Deep Tubular = 484mm
• Model 360 700c smooth Deep Tubular = 530mm
• Model 360 700c dimpled Deep Tubular = 530mm
  
• Model 415 700c smooth mid-v Clincher = 569mm
  
• Model 417 700c dimpled mid-v Clincher = 557mm
  
• Model 460 650c smooth Deep Clincher = 480mm
• Model 505 700c smooth Deep Clincher = 529mm
  
• Model 505 700c dimpled Deep clincher = 530mm
  
• Model 420 700c dimpled Super Deep Tubular = 484mm
  
• Model 520 700c dimpled Super Deep Clincher = 487mm
  
  
• CSC aluminum rim = 596mm