This great dynamo wheel features a Biologic Joule 3 dynamo hub. This hub is the lightest, most efficient hub dynamo on the market. It effortlessly powers the headlight, taillight and any smartphone simultaneously. Winner of the 2012 Eurobike award, BioLogic sets the standard for efficiency, compactness and style with the Joule 3. This wheel will only work on an Xtracycle with a quick release. It will not work on an EdgeRunner Swoop or Classic because of the thru axle fork.