Grin Phaserunner FOC Controller
Engineering-grade control in a tiny waterproof package. Field-oriented control gives silent, ultra-efficient power and works with almost any motor.
The Phaserunner is a high-end field-oriented-control (FOC) controller that runs motors with remarkable efficiency and near silence. It auto-tunes to your motor, is fully programmable over USB, and is potted and waterproof — a step above generic controllers in every measurable way.
It's aimed at serious builders who want the best: torque-sensor compatibility, regenerative braking on direct-drive motors, and precise current control. Overkill for a basic commuter, but the right brain for a premium custom build.
Where to buy
Two paths — match your spend to the build. Quality picks last longer and come with real support; affordable picks get you rolling for less. Always confirm fitment, voltage, and connectors for your bike first.
Quality picks
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Pro tips from our test team
- Use Grin's setup software and motor profiles for a painless auto-tune.
- Pairs beautifully with the Cycle Analyst for full data and torque-sensor input.
- Direct-drive motors gain regen braking with the Phaserunner.