MOZA R21 Ultra Direct Drive Wheel Base

21 Nm sustained direct drive power for serious sim racing rigs.

Name: MOZA R21 Ultra Direct Drive Wheel Base
Brand: Moza
SKU: RS090
Price: 744.35 EUR
Availability: InStock

The MOZA R21 Ultra is built for racers who want heavyweight direct drive force feedback without losing steering detail. It combines 21 Nm sustained torque, a zero-cogging flat-wire motor, 21-bit magnetic encoder, 600 MHz processing, RGB telemetry lighting and robust mounting support for high-end cockpits.

21 Nm torque zero-cogging motor 21-bit encoder

MOZA R21 Ultra Direct Drive Wheel Base angled product view - OCRacing

MOZA R21 Ultra installed on sim racing cockpit - OCRacing

MOZA R21 Ultra mounted in a sim racing cockpit - OCRacing

21 Nm sustained output

Real force feedback headroom for high-load cars and endurance stints.

MOZA lists the R21 Ultra with 21 Nm maximum torque and 360 W rated power. That torque range is for drivers who want more than heavy steering: it gives the base room to hold cornering load while still reproducing curbs, tire scrub, snap oversteer and braking instability.

pro-level torque less FFB clipping stable long sessions

Zero-cogging flat-wire motor

Powerful rotation without the notchy feel that hides fine detail.

The R21 Ultra uses a zero-cogging flat-wire motor designed for smooth response and high torque density. Around center, through slow corrections and during fast countersteer, the aim is cleaner steering feel with fewer mechanical distractions between your hands and the virtual front tires.

MOZA R21 Ultra flat-wire motor winding detail - OCRacing

MOZA R21 Ultra exploded direct drive motor assembly - OCRacing

21Nm torque

Sustained direct drive force for demanding car profiles.

0Zero cogging

Smoother rotation and cleaner feedback around center.

360W rated power

Strong motor output for high-torque force feedback.

DDDirect drive

No belt or gear train between the motor and wheel shaft.

MOZA R21 Ultra 21-bit magnetic encoder illustration - OCRacing

MOZA R21 Ultra force feedback algorithm visual - OCRacing

21-bit encoder and 600 MHz CPU

High resolution steering input backed by fast force feedback processing.

A 21-bit magnetic encoder gives the R21 Ultra 2,097,152 PPR steering resolution. MOZA also lists a 600 MHz high-performance processor, helping the base process force feedback quickly enough to keep small steering corrections, fast direction changes and curb impacts feeling sharp.

2,097,152 PPR 600 MHz CPU 1000 Hz USB

RGB telemetry and Pit House tuning

A premium base that can show useful racing signals, not only look good.

Dual RGB light strips support 16.7 million colors and MOZA describes telemetry-based effects for ABS, traction control, gear shifts and flag signals. With MOZA Pit House and mobile app support, the R21 Ultra can be tuned for force feedback behavior, firmware and cockpit preferences without turning setup into a chore.

MOZA R21 Ultra RGB light strip detail on sim racing rig - OCRacing

MOZA R21 Ultra mounting options diagram - OCRacing

MOZA Pit House

Tune force feedback, firmware and device behavior from one control center.

Telemetry RGB

Lighting can react to ABS, traction control, gear shifts and flag signals.

High-speed processing

600 MHz processing helps keep the feedback response immediate.

Mobile app support

Adjust supported settings from MOZA’s app ecosystem.

MOZA R21 Ultra side and rear product view - OCRacing

MOZA R21 Ultra rear side product angle - OCRacing

Front, side and bottom mounting

Ready for aluminium profile cockpits and high-torque installations.

The R21 Ultra supports front, side and bottom mounting, with an optional adjustable bracket available. Rear ports cover power, PC, pedals, dashboard, shifter, handbrake and emergency stop switch, making the base a strong center point for a full MOZA ecosystem cockpit.

front mount side mount bottom mount

What’s in the box

Official MOZA box contents.

R21 Ultra Wheel Base

The MOZA R21 Ultra direct drive wheel base.

Power adapter

External power adapter for the wheel base system.

Data cable

Connection cable for PC and MOZA Pit House setup.

Bolt kit and documents

Bolt kit, user manual and warranty card included by MOZA.

Technical specifications

MOZA R21 Ultra specs.

Product	MOZA R21 Ultra Direct Drive Wheel Base
OCRacing SKU	RS090
Official MOZA SKU	T02D110001A
Barcode	6973137271350
Platform	PC
Drive system	Direct Drive
Maximum torque	21 Nm
Rated power	360 W
Input voltage	110V~220V AC to 36V DC
Motor type	Zero-cogging flat-wire motor
Encoder type	21-bit magnetic encoder
Encoder resolution	2,097,152 PPR
Processor	600 MHz high-performance CPU
USB refresh rate	1000 Hz
Housing material	Aluminum alloy
Rear cover material	Plastic
Coupler material	Aluminum alloy
RGB light strips	2
Mobile app functions	Supported
Quick release	Supported
Ports	Power, PC, pedals, dashboard, shifter, handbrake, emergency stop switch
Mounting options	Front, side and bottom mounting supported
Emergency stop switch	Optional
Dimensions	248.8 x 140 x 135 mm
Weight	9.0 kg