Biologic Joule™ 3 Dynamo Hub

Power when you need it
Starting at $129.95

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 12.6 oz
  • One of the lowest drag of all dynamo hubs
  • Ultra-compact, super-lightweight design
  • German StVZO compliant (6V, 3W)
  • Available in 32-hole, 100 mm OLD (for disk brakes) and 20-hole, 74 mm OLD versions
Biologic Joule 3 Dynamo Hub

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Aluminum housing