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Check out the recent Bikerumor.com review
The Joule 3 currently is the lightest, most efficient bicycle dynamo hubs on the market. It is built up with a DT TK540 rim to create a super-light dynamo wheel(1200 Grams) with its patented magnet configuration, the hub yields a reduced drag and offers a 75% efficiency rating. Polishing, laser etching, and a precision machined flange pattern give high performance in a beautiful small package. Available in a disc-only version. Winner of a 2012 Eurobike Award.
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