Sinewave Reactor [Dynamo USB Charger]

This Sinewave Reactor replaces your steertube top cap. This is the cleanest dynamo charge port that we've seen. It is a very minimalistic piece of hardware. Half of it disappears into your steertube, so all that is showing is a somewhat chubby steertube top cap that has a standard USB port that you can use to charge your phone, gps or other device. Slick!
Your fork's steertube needs to have an ID of at least 21.5mm. If your fork is steel or aluminum, this should not be a problem, but not all carbon steertubes will fit this. Also, the wires need to go out the bottom of the steertube, so you should check and see if the bottom of the steertube is open (or at least has a hole big enough to fit wires through it).
The Reactor can charge your device directly, or you can charge the Cinq5 Smart Power Pack II and then charge your devices with the Power Pack. Using the Smart Power Pack is the most reliable way to charge devices with the Reactor (or any dynamo based charger).
Personally I've always had good luck charging iPhones with dynamo chargers, but not all devices manage power the same, so testing is the best way to be sure.

Instructions: HERE

Relevant Dynamo Blog Posts: Dynamo Lighting or Charging Devices w/Dynamo Power