Reactor USB Dynamo Charger
Sinewave Cycles Reactor USB Dynamo Charger Review
Tested and reviewed for bikepacking use
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 10other products we've reviewed.
How It Compares
At 85g and $175, the Reactor USB Dynamo Charger is 35g heavier than the lightest option in this category (the SP Connect Bike Bundle at 50g). The most budget-friendly option is the Anker Nano Power Bank 5000mAh at $20.
The price-to-weight ratio comes in at $206 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
The Sinewave Cycles Reactor USB Dynamo Charger earns a 4.4/5 rating. It's a solid performer that does most things well. Clean, regulated USB output is the standout feature, though requires a dynamo hub (sold separately) is worth considering before you buy.
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