Biologic Joule™ 3 Dynamo Hub

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

Get the Facts




82 x Ø58 mm (3.2” x Ø2.3”)


20-hole hub: 362 g (12.8 oz)
32-hole hub: 416 g (14.7 oz)

Load Capacity
Volume Capacity
Compatible Bikes

20-hole hub: 20″ wheel bikes with 74 mm OLD forks
32-hole hub: 24” and 26” wheel bikes with 100 mm OLD forks (V-brake and disc-brake compatible)

Compatible Items

Valo™ 2 Light

Aluminum housing very effectively, especially at low speeds. The price-to-quality ratio is above average.

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