United Bicycle Institute
Online Spoke Length Calculator
UBI Main Page
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Choose the Wheel or Tire Size:
Effective Rim Diameter (ERD):
Hub Flange Diameter:
Hub Center to Flange Center:
Hub Spoke Hole Diameter:
Number of Spokes in the Wheel:
Cross Pattern (3 cross, 4 cross, etc):
 
SPOKE LENGTH =
   
Sutherland's Rim
Correction Factor
 		=
   

Calculate a Rim Diameter (ERD) Using Existing Components


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