Granted, it’s not as much of a current draw as a big old incandescent headlight, but this wheel-powered cyclocomputer ... cell power sources. His bike’s hub dynamo offered interesting ...

or otherwise for a complete self-powered new bike build. DT offers the new 350 SP PL-7 dynamo hub on its own, in just one configuration for road- & gravel-focused custom wheel builds. Or there are ...