Professional Spoke Length Calculator
Welcome to the most comprehensive and accurate spoke calculator for bicycle wheels. Simply enter your component data below to get the perfect spoke lengths for a strong, reliable wheel build.
Designed for Professional & DIY Builders
This tool provides the precise calculations you need for all modern hub and spoke types, including J-bend, Straight Pull, and even advanced Berd PolyLight spokes.
Looking for a ready-to-ride wheel or wheelset? If you'd rather skip the math and have our shop assemble your wheel(s), head over to our Custom Wheel Builder. (Plus, get an automatic 10% discount on all complete wheelsets!).
Loading Components...
Front Wheel
Front Wheel
1. Rim & Spoke Count
Rear Wheel
Loading...
Technical Build Notes & Measurement Tips
DT Swiss 180 Straight Pull: When calculating for straight-pull hubs like the New DT Swiss 180, ensure you are measuring from the actual seating point of the spoke head. This ensures the most accurate results from our geometry engine.
ERD Verification: Effective Rim Diameter is the most critical variable. A 1mm error in ERD results in a 0.5mm error in spoke length. We recommend measuring every rim manually at four points before cutting spokes.
Asymmetric Rim Offset: For rims with an Offset Spoke Bed (OSB), the calculator correctly adjusts bracing angles. Ensure you enter the manufacturer's specified lateral offset in the 'Asymmetry' field to balance tension ratios.
Spoke Tension Balance: Tension ratios are a geometric result of hub flange spacing. High-quality builds aim for the highest possible tension on the 'slacker' side without exceeding the rim's maximum kgF limit.
Wheel Geometry Visualization
Display Options
Color Scheme
Cross Pattern
Paired Hub Holes
Geometric Data
Note for 2026: When calculating for straight-pull hubs like the New DT Swiss 180, ensure you are measuring from the actual seating point of the spoke head.