TROY Intelligent

Disrupting Traditional Layout! DONUT Hollow Hub Motor Debuts, Futuristic Electric Motorcycle Revealed

2026-07-29

The first thing you notice about the rear wheel will likely make you pause for half a second: the hub is hollow, yet the visual presence feels heavier, more grounded.

DONUT Hollow Hub Motor Electric Motorcycle

When I came across these real-world photos last week, what struck me first was not how hard this bike could accelerate, but how the rear wheel fundamentally rewires the structural habits of traditional electric motorcycles. I have been riding for 8 years and have owned 6 different types of bikes. The most expensive lesson I learned is simple: I used to be unable to resist retro styling, and was fooled by aesthetics into buying two bikes that rode terribly. So now when I look at a new bike, I ask a very cold question first: does its beauty actually serve the riding experience?

Hollow Rear Wheel Is Not a Gimmick — It Changes the Body Proportion First

Viewed from the side, the most eye-catching element is not the red bodywork but the enclosed hollow frame and those striking orange power cables. Traditional gasoline motorcycles treat the engine as the visual centerpiece, while conventional electric motorcycles often turn the battery box into a bulky black block. This machine's approach is more like laying the powertrain out on display for you to see.

This matters. Because it is not simply about making the shell look sharp — it creates a new relationship between the mid-body space, rear wheel space, and battery space. The hollow geometric frame lets you read at a glance that "the internals are not stacked the old way," and the orange wiring harness visually traces the power path, as if telling you: do not just stare at the shell — the layout is the point.

Here is a simple way to evaluate this kind of bike: do not first ask whether it looks like a concept vehicle. First check where the heaviest components are placed. If the battery, motor, and controller are all squeezed into positions just to serve the styling, the ride will usually betray the design. If the styling is instead the result of structural reorganization, then it is worth continuing to look.

Flat Solid-State Battery — The Real Value Is Center-of-Gravity Freedom

DONUT Flat Solid-State Battery Module

This Donut solid-state battery module is critical. Its flat integrated packaging does not occupy a single large volume block like traditional battery boxes — it leaves more layout flexibility for the lower frame. Many people, when discussing electric motorcycles, still jump first to voltage, motor power, and zero-to-sixty times. But in the city, what truly tortures you daily is often those few seconds of low-speed maneuvering and U-turns.

The benefit of a low center of gravity is not mystical. Creeping forward half a meter at a time at a red light, your wrists do not have to constantly brace against the front end. Making a U-turn in an underground garage ramp, your core does not have to tense up first before wrestling the bike around. That feeling is not "fast" — it is the sensation that the bike's weight has not suddenly crashed onto you.

⚠️ However, solid-state batteries should not be mythologized at this stage. Under sustained aggressive acceleration, thermal management performance is the real benchmark. A flat battery requires that the heat dissipation paths, housing thermal conductivity, and control strategy all keep pace. Looking only at that beautiful module in the marketing materials makes it easy to fall into a trap: assuming that a novel battery form factor equals overall durability. Then in the summer, after repeated high-load pulls, the power drops and you realize you bought imagination, not capability.

When the Rear Wheel Is Hollow, Unsprung Mass Becomes Worth Discussing

That angle best reveals the rear wheel's ambition: the hollow rear wheel assembly eliminates the central hub motor structure. The center position is no longer stuffed with a chunk of motor, and the outer ring's mechanical structure becomes the visual focal point instead. Its impact does not come from loud decals — it comes from "something that should be there is missing."

People easily interpret this as showing off, but I care more about unsprung mass. The problem with conventional hub motors is that the motor bounces together with the wheel. Over speed bumps, manhole covers, and broken pavement, the rear wheel hit feels noticeably heavier. If the hollow structure can liberate the motor and its main weight from inside the wheel, the suspension response has a chance to be cleaner.

Here is the counterintuitive part: many people assume that wide tires plus a hollow rear wheel equal greater stability, but low-speed U-turns may actually cost more shoulder effort. Large-section wide tires have a big contact patch — as soon as you turn the bar, the tire pushes back with resistance that says "do not be careless." I once pushed a wide-tire electric motorcycle in a shopping mall garage, turning around at a ramp junction. My right shoulder ached first, and my heels kept adding small shuffle steps. That is not something a single weight number on a spec sheet can explain.

So when evaluating a wide-tire electric motorcycle, do not judge only by how cool it looks standing still. Ride two circles at around 10 km/h and feel whether the handlebar return is sluggish. Then creep over a speed bump slowly and listen to whether the rear wheel and suspension bounce chaotically together. Low speed reveals the truth.

Orange Power Lines — The Visual Core of This Machine

The orange wiring harness is not random decoration. It strings together the power relationship between the mid-body, swingarm, and rear wheel, letting you understand its difference from conventional layouts without needing to remove any body panels. Many electric motorcycles try to hide cables as cleanly as possible — this one instead turns them into part of the mechanical expression.

DONUT Electric Motorcycle Orange Power Cables Detail

This creates a strong visual impulse. Red bodywork, black skeleton frame, orange power cables — the combination produces not a gentle aesthetic but a hard-edged mecha feel. And therein lies the issue: the more you expose structure as a visual symbol, the more maintenance cannot be judged by appearance alone. Cable routing, mounting points, waterproof connectors, and swingarm clearance must all withstand daily vibration.

❌ A very common mistake: seeing the hollow rear wheel and Hollow out frame and ordering immediately, only to realize later that you want to add a rear seat, tail box, or side bags — and discovering that the wide rear tire has already consumed too much rear space, with bracket mounting points not so easy to find. Before buying, at minimum confirm whether you will carry a passenger, need a tail box, or frequently haul cargo. When fully loaded, the balanced feel from a low center of gravity will also be rewritten by luggage placement.

New-Style Electric Motorcycles: Stop Obsessing Over Acceleration Numbers

This category of bike is most easily discussed in terms of "futuristic feel" and "acceleration data." But for ordinary riders, what truly affects daily use is the body's physical response to the layout: whether your wrists ache during low-speed maneuvering, whether wide tires require you to pre-load your shoulders before corner entry, whether reversing out of a parking spot forces your heels to constantly search for the ground.

I prefer to see this as a structural experiment. The hollow rear wheel brings recognizability, and potentially higher maintenance complexity. The flat solid-state battery releases design space, but must also pass thermal management scrutiny. The hollow frame exposes mechanical beauty directly, while simultaneously placing expansion limitations front and center.





Hollow Hub Motor;

DONUT hollow hub motor;

hollow hub motor electric motorcycle


 
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