Sinewave Reactor

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The Sinewave Reactor takes the performance of our Revolution dynamo-powered USB charger and shrinks it into a package that fits above the star-fangled nut in a threadless steerer tube, with a pass through for the 6mm bolt. The only visible part is a custom CNC-milled stem cap holding the USB connector. The cap is only 9.8mm tall and available in silver or black.

The Reactor is compatible with 1" and 1 1/8" threadless systems.


  • Bicycle touring
  • Commuting
  • Green/Portable Electricity for USB Powered Devices
  • Power USB Battery Chargers or External USB Power Packs
  • Emergency Power Source
  • Navigation while riding
  • Music while riding
  • Best in class efficiency
  • High Speed Overload Protection
  • Simple Installation
  • Light weight
  • Shock and vibration toughened
  • Waterproof
  • Gold-plated USB connector won’t rust or corrode
  • Starts charging at 3.5 MPH (5.5 km/h)
  • Full charging at 9 MPH (14.4km/h)
  • Max current: 1 Amp
  • Weight: 37 grams
  • Dimensions: 14x35x54 mm
  • Wire length: 36″ (91 cm) (contact us if your setup requires a longer wire)
  • Wire ends: Stripped wire
About Us

Good Rotations is an independent online bikepacking and adventure cycling store. Our aim is encourage the use of bicycles for everyday journeys and bigger adventures!

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