Biologic Joule 3 Dynamo Hub
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