Sinewave Cycles Reactor top cap style dynamo USB charger

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Sinewave Cycles Reactor top cap style dynamo USB chargerSinewave Cycles Reactor Top Cap Dynamo USB ChargerSinewave Cycles Reactor BlackSinewave Cycles Reactor Silver

USB charger top cap.

$399.90 incl GST

or 6 weekly interest free payments of $66.65 with Laybuy


The perfect "hidden" USB charger for bikepacking, cycle touring or the daily commute.

The Sinewave Reactor takes the performance of our Revolution bicycle 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, black and red. The Reactor is compatible with 1" and 1 1/8" threadless systems.

The Reactor is made in the USA.

Reactor Frequently Asked Questions

Reactor installation instructions can be found here.
An excellent installation guide, with pictures, can be found here.


Unlimited Power For:
Cell Phones
Battery Packs
Rechargeable Headlights
Rechargeable Speakers
Any USB-powered device!

Best in class efficiency
High Speed Overload Protection
Easy Installation
Shock and vibration toughened
Gold-plated USB connector won't rust or corrode

Starts charging at 5.5 km/h
Full charging at 14.4km/h
Max current: 1 Amp
Also works with DC input up to 52V
Stack height: 9.8mm
Wire length: 91 cm (contact us if your setup requires a longer wire)
Wire ends: Stripped wire (for hub connection), Reactor pins (for Reactor connection)

1 year