The next generation of electric motorcycle performance is not only about bigger batteries or stronger controllers. At the heart of every powerful e-moto build is a motor that can deliver instant torque, high efficiency, reliable thermal performance, and compact installation.
That is why TRB Power developed the T9900 Series Mid-Drive Motor, including the T9900 28KW version and the higher-output T9900-R 32KW version. Designed for Light Bee-style electric motorcycles, high-power e-bike upgrades, off-road e-moto builds, and custom 72V drivetrain platforms, the T9900 series brings serious power into a compact and durable motor package.
Built for High-Power Electric Motorcycle Performance
The TRB Power T9900 series is engineered for riders and builders who want a clear performance upgrade from standard electric motorcycle motors. Both versions use a 72V rated voltage platform, a compact φ180 × 145mm motor body, and a lightweight 10.75 kg structure, making them suitable for mid-drive installation where power density and vehicle balance are critical.
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. For riders looking for stronger acceleration, higher load capability, and more aggressive off-road performance, the T9900-R offers an even more powerful upgrade path.
Strong Torque for Instant Acceleration
Power is only part of the story. Torque delivery is what riders feel the moment they open the throttle.
Both the T9900 and T9900-R are rated at 22 N·m torque and provide up to 65 N·m peak torque, with 800A peak phase current support. This gives the motor the ability to deliver fast response, strong climbing performance, and confident acceleration in demanding riding conditions.
Whether used for trail riding, hill climbing, performance street builds, or custom electric motorcycle conversions, the T9900 series is designed to provide the strong and responsive output that high-power riders expect.
High-Speed Capability up to 9000 RPM
The T9900 series is designed for both torque and speed. With a 5200 RPM rated speed and up to 9000 RPM peak speed, the motor gives builders more flexibility when tuning gearing, controller settings, and final drive ratios.
This high-speed capability makes the motor suitable for performance-focused electric motorcycles where top-end output and acceleration both matter.
Compact, Lightweight, and Mid-Drive Ready
A high-performance electric motorcycle motor must deliver power without making the vehicle difficult to package. The T9900 series uses a compact motor size of φ180 × 145mm and weighs only 10.75 kg, helping builders maintain a cleaner installation and better overall weight distribution.
Its mid-drive installation position supports efficient power transfer and improved vehicle balance compared with hub motor setups. For Light Bee-style platforms and custom e-moto builds, this makes the T9900 series a strong choice for performance upgrades.
Designed for Efficiency and Durability
Efficiency is essential in any electric drivetrain. The T9900 series offers a maximum efficiency of ≥93%, helping reduce energy loss and improve overall drivetrain performance. The performance curve shown in the product specification also highlights a broad high-efficiency operating range across different torque and speed zones.
The motor also features:
- IP67 protection grade
- Class F insulation rated to 155°C
- NTC temperature sensor
- Encoder position sensor, default ABZ
- Gear drive transmission
- Natural air cooling
- 5 pole pairs
These features make the motor suitable for demanding riding conditions where heat, dust, moisture, and mechanical stress can affect performance.
T9900 vs. T9900-R: Which Version Is Right for Your Build?
The T9900 28KW is an excellent choice for riders who want a strong high-performance upgrade with serious peak power, smooth output, and reliable efficiency. It is well suited for Light Bee upgrades, off-road e-moto builds, and 72V custom drivetrain projects.
The T9900-R 32KW is built for users who want even more power. With 16KW rated power and 32KW peak power, it is the stronger option for more aggressive setups, heavier loads, or riders who want maximum performance from the T9900 platform.
Key Specifications
| 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 |
Ideal Applications
The TRB Power T9900 series is ideal for:
- Light Bee performance upgrades
- Electric motorcycle conversions
- High-power e-bike builds
- Off-road e-moto projects
- 72V custom drivetrain systems
- Racing and performance-focused electric platforms
Final Thoughts
The TRB Power T9900 Series was developed for riders and builders who need more than a standard electric motorcycle motor. With up to 32KW peak power, 65 N·m peak torque, 9000 RPM peak speed, IP67 protection, and ≥93% maximum efficiency, the T9900 and T9900-R provide a strong foundation for serious electric performance.
For builders looking to unlock more power, stronger torque, and better performance from a Light Bee-style or custom e-moto platform, the TRB Power T9900 series is built to take electric riding to the next level.
