Biologic Joule™ 3 Dynamo Hub Comp Wheel (Front)

73% generator efficiency — one of the most efficient One of the lowest drag of all available dynamo hubs Built and trued by hand Butted spokes are light but strong Double-walled rims for stiffness and strength German StVZO compliant (3W, 6V) 100 mm hub --- DESCRIPTION --- The Joule 3 dynamo hub rim set lets you generate electricity to power your lights or charge devices on your bike while riding. The Joule 3, winner of a 2012 Eurobike Award, is one of the lightest, most efficient bicycle dynamo hubs on the market, which means more power generated at a given speed. The patented magnet configuration yields barely noticeable drag while a polished, laser etched, and precision-machined flange pattern present high performance in a beautiful, small package. --- TECHNICAL --- Color(s) 20" Silver hub disc 24" Black hub Dimensions n/a Weight   Load Capacity n/a Volume Capacity n/a Compatible Bikes Compatibility Checker Compatible Items Valo™ 2 Light Material n/a