BioLogic Joule™ 3 Dynamo Hub

Make your own juice

A hub dynamo is the ultimate green power source because it generates electricity while you ride—no batteries or recharging required. The Joule 3 is one of the very lightest and smallest dynamo hubs on the market and is one of only a handful that exceeds the High Efficiency (HE) 70% threshold. Say goodbye to batteries. Winner of a Eurobike award, the Joule 3 meets German StVZO standards for a 6V/3W hub—meaning it can power both a front and rear light.

73% Efficiency

The Joule 3 is so efficient that there’s no noticeable drag even as it’s powering your lights. Most other dynamo hubs are much less efficient; the lower the efficiency, the more drag you feel when you’re riding.

Ultra Light

The non-disc version of the Joule 3 hub weight a mere 356 grams.

Disc Version

Available in 6-bolt disc brake version with 100 mm OLD.