For a high-performance electric motorcycle, the motor is more than just a power unit. It defines acceleration, climbing ability, throttle response, efficiency, heat control, and long-term stability under demanding riding conditions. The TRB Power T9900 Series Mid-Drive Motor is designed for riders and builders who want stronger output from Light Bee-style platforms, electric motorcycle conversions, and 72V high-performance drivetrain systems.
The T9900 series includes the T9900 28KW version and the higher-output T9900-R 32KW version. Both models use a 72V rated voltage platform, a compact φ180 × 145mm motor body, and a lightweight 10.75 kg design. They are built for mid-drive installation and deliver up to 65 N·m peak torque, 9000 RPM peak speed, ≥93% maximum efficiency, and IP67 protection.
Wide High-Efficiency Range for Real Riding Performance
The performance curve shows a broad high-efficiency operating zone across the mid-to-high speed range. The red and dark red areas indicate the motor’s strongest efficiency region, mainly concentrated from approximately 3000 RPM to 6500 RPM.
This means the T9900 series is not only built for short bursts of power, but also for sustained riding efficiency. In real-world use, higher efficiency helps convert more battery energy into usable drive power while reducing energy loss and heat buildup.
For riders, this translates into better performance consistency during trail riding, off-road climbing, high-speed riding, and long-duration e-moto use.
Strong Torque Output for Launch, Climbing, and Off-Road Control
Torque is what riders feel immediately when opening the throttle. Both the T9900 and T9900-R provide 22 N·m rated torque and up to 65 N·m peak torque, supported by 800A peak phase current.
From the performance curve, the motor builds strong torque quickly as speed increases from the low-speed range into the mid-speed range. This makes it especially suitable for:
- Hard launches
- Steep hill climbs
- Technical off-road riding
- Corner-exit acceleration
- Mud, sand, and loose-terrain riding
- High-load electric motorcycle applications
For Light Bee-style platforms, this torque behavior creates a much stronger and more responsive riding feel compared with standard power setups.
Up to 32KW Peak Power for Serious E-Moto Builds
The T9900 28KW version delivers 14KW rated power and 28KW peak power, while the T9900-R 32KW version increases output to 16KW rated power and 32KW peak power.
The 28KW version is ideal for riders who want a powerful and balanced performance upgrade. The 32KW T9900-R is designed for more aggressive builds where maximum acceleration, stronger peak output, and higher-load performance are required.
When paired with a suitable high-power controller and battery system, the T9900-R can unlock the full potential of a 72V performance drivetrain.
9000 RPM Peak Speed for Flexible Gear Ratio Tuning
The T9900 series features a 5200 RPM rated speed and up to 9000 RPM peak speed.
This high-speed capability gives builders more flexibility when selecting gear ratios, sprocket combinations, wheel sizes, and controller settings. Whether the target is stronger low-speed torque or higher top-speed performance, the T9900 series provides a wide tuning window for different riding styles.
High Efficiency Means Better Thermal Stability
A powerful motor must also control heat effectively. With a maximum efficiency of ≥93%, the T9900 series helps reduce unnecessary energy loss during operation.
The performance curve also shows that the motor maintains a strong efficiency zone across a wide operating range. This is important because lower energy loss means less heat generation, more stable output, and improved reliability during repeated acceleration or long off-road sessions.
The motor also includes:
- Natural air cooling
- NTC temperature sensor
- Class F insulation rated to 155°C
- IP67 protection grade
- Gear drive transmission
- Encoder position sensor, default ABZ
These features help support demanding riding environments where heat, dust, moisture, and vibration are common challenges.
Designed for Mid-Drive Performance Platforms
Unlike hub motors, a mid-drive motor allows the vehicle to use drivetrain gearing more effectively. The T9900 series is designed for mid-drive installation, helping improve weight distribution and power transfer efficiency.
For performance electric motorcycles and Light Bee-style builds, this layout supports better balance, stronger acceleration, and improved off-road handling.
T9900 vs. T9900-R Performance Comparison
| Specification | T9900 28KW | T9900-R 32KW |
|---|---|---|
| Rated Voltage | 72V | 72V |
| Rated Power | 14KW | 16KW |
| Peak Power | 28KW | 32KW |
| Rated Torque | 22 N·m | 22 N·m |
| Peak Torque | 65 N·m | 65 N·m |
| Peak Phase Current | 800A | 800A |
| Rated Speed | 5200 RPM | 5200 RPM |
| Peak Speed | 9000 RPM | 9000 RPM |
| Maximum Efficiency | ≥93% | ≥93% |
| Motor Size | φ180 × 145mm | φ180 × 145mm |
| Motor Weight | 10.75 kg | 10.75 kg |
| Installation Position | Mid-drive | Mid-drive |
| Protection Grade | IP67 | IP67 |
| Cooling Method | Natural air cooling | Natural air cooling |
| Transmission Form | Gear drive | Gear drive |
Built for Riders Who Need More Than Standard Power
The TRB Power T9900 Series is designed for riders who want a major upgrade in motor performance. With up to 32KW peak power, 65 N·m peak torque, a wide high-efficiency operating range, and up to 9000 RPM peak speed, it provides the foundation for serious electric motorcycle performance.
Whether used for a Light Bee upgrade, off-road e-moto build, high-power e-bike conversion, or custom 72V electric drivetrain, the T9900 series is built to deliver stronger acceleration, better efficiency, and more confident riding performance.
