EBMX Controller Review: The Best Upgrade for Your Surron?
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EBMX Controller Review: The Upgrade That Transforms Your Sur Ron
The EBMX Ultra Bee Controller and EBMX Sur Ron Controller are redefining what's possible on electric dirt bikes — here's everything you need to know.
If you've spent any time in the Sur Ron community, you've heard the name EBMX come up over and over again. And for good reason. The stock Sur Ron controller does its job, but serious riders — the ones chasing real performance on trails, tracks, and everything in between — hit its ceiling fast. The EBMX X-9000 is the answer to that ceiling, and it's become the go-to aftermarket controller for Ultra Bee and Light Bee owners who want to unlock what their bike is actually capable of.
Here's an in-depth look at what makes the EBMX Sur Ron controller such a game-changer.
What Is the EBMX X-9000?
The EBMX X-9000 is a purpose-built aftermarket motor controller designed specifically for electric dirt bikes — Sur Rons in particular. Now in its third generation (V3), it's gone through serious refinement since its debut and has become the benchmark that every other aftermarket controller is measured against.
The X-9000 offers significant power improvements ranging from 6KW up to a maximum of 50KW, with exceptional tunability that allows riders to finely adjust torque delivery and throttle curve to suit their individual riding style. That combination of raw power potential and fine-grained tuning is what separates it from every other option on the market.
FOC Technology and Throttle Feel
One of the most immediately noticeable things about the EBMX Ultra Bee controller is the throttle feel. The V3 runs on custom EBMX VESC firmware with Field-Oriented Control (FOC).
The FOC firmware delivers silky smooth throttle control, enhanced motor control, and greater efficiency — giving riders a powerband that feels refined and predictable rather than abrupt or jerky. If you've ever ridden a stock Sur Ron and felt that on/off, binary throttle response, the difference when you bolt in the X-9000 is immediately apparent. Power delivery becomes linear, controlled, and confidence-inspiring — whether you're crawling through technical terrain or pinning it on a straight. eDirtyBike
Tuning: Full Control From Your Phone
Where the EBMX Sur Ron controller really earns its reputation is in the tuning ecosystem. EBMX built a free companion app (available on both iOS and Android) that puts full control of the bike's behavior in the palm of your hand.
Through the EBMX app, riders can customize throttle curves, power output, regenerative braking, and speed limits across multiple ride modes — allowing the controller to adapt to any setup or riding style, from technical trail riding to open-road cruising.
The V3 features six fully customizable power levels spanning both race and street modes, along with a graphical UI for throttle tuning, regen braking, and EBMX E-Clutch settings. Whether you're setting up a beginner-friendly trail mode for a less experienced rider or dialing in a race-tuned profile for competition, it's all there without needing a laptop or a tuner. Electron Cycles
Wheel Lift Assist — A Standout Feature
The V3 introduced something no other controller in this class offers: an integrated Wheel Lift Assist (WLA) system powered by a real-time IMU.
The Wheel Lift Assist gives riders full control over front-end behavior during acceleration, launches, and climbs — whether the goal is preventing unwanted wheelies on steep hills or fine-tuning front-end lift for stunts. The system modulates throttle and applies regenerative braking based on user-defined settings, and is fully tunable through the EBMX app. It's a sophisticated safety and performance feature that genuinely changes how the bike handles at the limit. EBMX
Build Quality and Waterproofing
The X-9000 is engineered with CNC-machined internals and bus bars, an injection-molded cover, and fully waterproof IP67-rated connectors on all harness connections — making it ready for rain, mud, and the kind of conditions electric dirt bike riders actually ride in. eDirtyBike
The controller also includes a built-in, programmable DC/DC converter. Four programmable 12V outputs allow riders to run a coolant pump, headlights, and other accessories — all controllable directly through the app. That's a level of thoughtfulness in design that goes well beyond what you typically see in aftermarket components. eDirtyBike
Compatibility: Who Is It For?
The EBMX Ultra Bee controller is a direct bolt-in replacement with no extra brackets or wiring required for Sur Ron Ultra Bee and Light Bee owners. The V3 also supports a broad range of motors including OEM Sur Ron motors, EBMX motors, QS138, and other VESC-compatible setups — with over 30 preloaded motor tunes and more than 15 plug-and-play configurations out of the box. Electric Cycle Rider
One important note for stock battery users: riders running the OEM Sur Ron motor can safely run up to 15KW of power, and those on a stock Sur Ron battery can safely run up to 17KW — exceeding these thresholds risks overheating the motor or unsafe voltage sag from the battery. Plan your build accordingly, especially if you're considering pairing the controller with an upgraded battery or motor down the road. EBMX
The Verdict
The EBMX X-9000 is, simply put, the best aftermarket controller available for the Sur Ron platform right now. Whether you're running a stock Ultra Bee looking for more refinement and tuning flexibility, or building a high-power setup around an upgraded motor and battery, the EBMX Sur Ron controller scales with your build in a way nothing else on the market does.
The FOC throttle feel alone is worth the upgrade for many riders. Add in the app-based tuning, Wheel Lift Assist, IP67 waterproofing, and broad motor compatibility, and you have a component that doesn't just improve your bike — it transforms it.
Who should buy it: Any serious Sur Ron Ultra Bee or Light Bee rider looking to tune, upgrade, or simply get the most out of their existing setup.
Who can wait: Casual backyard riders who are happy with stock performance and have no plans to modify their bike further.
Rating: 9.5/10
Power | Tunability | Build Quality | Ease of Install | Value