USB

Review: Sinewave Revolution

Dynamo, aka generator, hubs are a great way to power bicycle electronics. You never have to worry about carrying spare batteries for your lights, and if paired with a dynamo USB charger, you’ll never have to worry about keeping your smartphone/GPS charged. The problem I’ve found with dynamo USB chargers, though, is that the reliable models are not modestly priced, and the modestly pric...