Biologic Joule 3 Dynamo Hub

Power when you need it

Our award-winning BioLogic Joule 3 is one of the lightest, most efficient bicycle dynamo hubs on the market. Its patented magnet configuration yields barely noticeable drag. Polishing, laser etching, and a precision machined flange pattern deliver high performance in a beautiful small package. Available in disc and non-disc brake versions.

  • 73% generator efficiency—one of the most efficient
  • Lightest version weighs only 356 g
  • One of the lowest drag of all dynamo hubs
  • Ultra-compact, super-lightweight design
  • German StVZO compliant (6V, 3W)
  • Available in 2 sizes: 20 holes and 32 holes
Biologic Joule 3 Dynamo Hub

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Aluminum housing