Bike Spoke Length Calculator
Calculate precise spoke lengths for wheel building based on hub, rim, and lacing pattern specifications
About this calculator
The Bike Spoke Length Calculator determines the exact spoke length needed for wheel building by calculating the precise distance between hub and rim based on your specific components and lacing pattern. This tool eliminates guesswork and measurement errors, ensuring proper spoke tension and wheel strength. Whether you're building road, mountain, or custom wheels, accurate spoke length calculation is essential for optimal wheel performance, durability, and safety.
How to use
Enter your rim's effective radius diameter (ERD), hub flange diameter, and center-to-flange distance measurements. Select your desired lacing pattern (radial, 1-cross, 2-cross, 3-cross, etc.) and specify whether you're calculating for drive or non-drive side spokes. The calculator will instantly provide the precise spoke length needed for your wheel build.
Frequently asked questions
What is ERD and how do I measure it?
ERD (Effective Rim Diameter) is the diameter where spoke nipples sit. Measure from nipple seat to opposite nipple seat through the rim center.
Which lacing pattern should I choose?
3-cross is most common for strength and durability. Radial lacing is lighter but only suitable for front wheels and disc brake applications.
Do I need different spoke lengths for each side?
Yes, drive and non-drive sides typically require different lengths due to hub asymmetry, especially on rear wheels with cassettes.