Stepping Into a New Era with MOZA R21 Ultra & R25 Ultra True Torque Wheel Base

During this year’s Gamescom, we proudly unveiled two new additions to our flagship high-end wheelbase lineup — the R21 Ultra and R25 Ultra True Torque Wheelbases. The R25 Ultra was showcased and tested on our sim rig, receiving positive feedback from visitors and seasoned experts in the field. 

Designed for serious racers, these models redefine what high-torque direct drive wheelbase can deliver — offering unparalleled precision, control, and immersion with every lap.

Explore the full breakdown of these two iconic new wheelbases and why they are worth upgrading below.

New Features & Enhancements:

● All-new Zero-cogging Flat-wire Motor

After years of focused R&D, we’ve continued to bring our automotive engineering excellence into sim racing hardware. With the R21 Ultra and R25 Ultra, we became the first to introduce flat-wire motor technology—widely adopted in new-energy vehicles, aerospace engineering and more—into the sim racing world, making them the world’s first wheelbases equipped with this breakthrough innovation.

The R21 Ultra and the R25 Ultra True Torque Wheelbase are equipped with the MOZA’s next-generation custom flat-wire motor, delivering 21-25Nm of peak torque and offering 26% higher torque density than similarly sized competitors. With true zero cogging, it ensures ultra-smooth rotation and accurately reproduces every detail—from subtle steering inputs to aggressive cornering forces—capturing the full mechanical feel of real-world driving.

Why Flat-wire Motor Technology:

- Higher Torque Density: Flat-wire motor is a more compact and powerful motor for faster acceleration, improved efficiency, dynamic response and a lighter overall system. 

- Enhanced Thermal Performance: Superior heat dissipation sustains peak torque for longer, preventing performance loss during intense sessions.

- Eliminated Cogging: With reduced stator slot size in the flat-wire motor, cogging is eliminated, enabling perfectly smooth rotation, less noise, high-precision force feedback and a more realistic driving feel.

- Better Durability: With its higher fidelity and better resistance to cogging, the flat-wire motor delivers superior anti-vibration and anti-shock capabilities, ensuring greater long-term durability.

● 600MHz High-performance CPU

R21 Ultra and R25 Ultra are first in the industry to feature the 600MHz High-performance CPU, which leads to higher data processing speeds, enabling high torque conversion rates, ultra-low latency, and the stable operation of advanced force feedback algorithms.

● Redefined Design with RGB Customization 

The two new wheelbases feature the refreshed design—Dual RGB light strips along the top edges offer 16.7 million colors and fully customizable lighting effects, including real-time telemetry feedback for ABS, traction control, gear shifts, and flag signals.

Core Features Retained:

● 21-bit Magnetic Encoder  

Delivers 2,097,152 steps per revolution with 0.00017° resolution for ultra-smooth steering response and incredibly detailed force feedback.

● New Force Feedback AlgoThe powerful R21 Ultra and R25 Ultra base pairs seamlessly with MOZA’s advanced New Force Feedback Algorithm, combining cutting-edge hardware and software. This synergy delivers more realistic force feedback and enables precise tuning tailored to every driving style.

● CNC-machined Aluminum Housing and Extreme Durability

Constructed from a rigid die-cast aluminum unibody, these two bases offer exceptional structural integrity and torsional rigidity—essential for withstanding high-torque output—while keeping overall weight to a minimum.

R25 Ultra Exclusive Feature:

● Exclusive True Torque Sensor for real time torque sensing 

The R25 Ultra Base is equipped with real-time torque sensing, delivering a sampling accuracy of 0.1% and a response frequency of up to 2 kHz. This advanced torque sensor captures your steering input with precision, giving you sharper handling, tighter control, and unparalleled detail.

The R21 Ultra and R25 Ultra True Torque represent MOZA’s most advanced direct drive wheelbases to date, delivering professional-grade force feedback, industry-leading precision, and uncompromising build quality. Whichever you choose, you're stepping into the most advanced force feedback we've ever made.