Joule™ 3 Dynamo Hub

The Joule 3 is one of the lightest, most efficient bicycle dynamo hubs on the market. It can be built up to create super-light dynamo wheels and its patented magnet configuration yields barely noticeable drag. Polishing, laser etching, and a precision machined flange pattern give high performance in a beautiful small package. Available in disc and non-disc brake versions. Winner of a 2012 Eurobike Award.

  • 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 32-hole, 100 mm OLD (for disk brakes) and 20-hole, 74 mm OLD versions
  • Available in silver or black