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Sinewave Cycles Reactor USB Dynamo Charger — Specs & Analysis
Manufacturer specifications, compared against every other electronics & power in our database. We do not test gear in the field — we measure, verify, and compare.
The Reactor converts alternating current from a dynamo hub into clean, regulated USB power. It mounts neatly to the headset spacer stack and provides up to 5W of charging power at typical riding speeds. A reliable bridge between your dynamo hub and your devices.
Who Is the Sinewave Cycles Reactor USB Dynamo Charger Best For?
Dynamo-equipped tourers who want the cleanest and lightest USB charging solution. If that describes your riding style, the Reactor USB Dynamo Charger should be at the top of your shortlist. It sits in the Electronics & Power category alongside 12 other products we track.
How It Compares
At 43g and $220, the Reactor USB Dynamo Charger is the lightest option in this category. The most budget-friendly option is the Voltaic Systems Arc 10W Solar Panel at $25.
The price-to-weight ratio comes in at $512 per 100g — a premium price point, but you're paying for quality, materials, and design that justify the investment for serious bikepackers.
What We Like
- +Clean, regulated USB output
- +Elegant headset spacer mount
- +Works at walking speed and above
- +Extremely lightweight and compact
Watch Out For
- −Requires a dynamo hub (sold separately)
- −Output limited at very low speeds
- −Expensive for what is essentially a converter
The Bottom Line
We haven't scored the Sinewave Cycles Reactor USB Dynamo Charger, and neither has anyone else we can cite. It's here for its verified specifications and dimensions, which is what the fit tools run on — a score is an editorial judgement, and we don't hand one out until someone has a basis for it. What this page can tell you is measured: 43g, $220, and how both sit against every other electronics & power product we track.
Price and Weight checked against the manufacturer on 18 August 2026 — see the source.
Specifications and dimensions come from the sources listed above. Where a page draws on first-hand riding, it says so.
How it compares
Against the 13 electronics & power products we hold published specs for.
At 43g the Reactor USB Dynamo Charger is the lightest in the category we track, against a category median of 195g.
At $220 it undercuts 1 of 12 of them, against a median of $60. That works out at $512 per 100g — above the $40 median for electronics & power products.
Weight and price come from published specifications. Cost per 100g is a blunt measure — it rewards light gear and says nothing about durability or whether the thing works — so treat it as one input, not a verdict.
More in Electronics & Power
Power banks, solar panels, dynamo chargers, and phone mounts to keep devices alive on multi-day rides.