The MOZA R21 Ultra Bundle is a sim racing package built around the R21 Ultra direct drive wheelbase with 21 Nm of sustained torque, plus your choice of steering wheel and pedal set, compatible with PC and aimed at competition, training and simulation centres.
The R21 Ultra introduces MOZA's zero-cogging flat-wire motor, with a 21-bit magnetic encoder at 2,097,152 PPR, intelligent cooling and two RGB strips with configurable telemetry. It is one of the most powerful bases in the direct drive wheelbase range and supports bottom, front and side mounting.
Key features of the MOZA R21 Ultra Bundle
- 21 Nm of sustained torque from an industrial motor that does not cut force during endurance sessions.
- Zero-cogging flat-wire motor, with step-free rotation and faithful reproduction of road surface detail.
- 21-bit magnetic encoder at 2,097,152 PPR: over two million points of resolution per revolution.
- iRacing 360Hz mode for a faster force feedback update rate.
- Aluminium unibody measuring 248.8 × 140 × 135 mm at 9.0 kg, with bottom, front and side mounting.
- Two RGB strips with 16.7 million colours showing telemetry for ABS, traction control, gear shifts and flags.
R21 Ultra wheelbase technical specifications
| Specification | Value |
|---|---|
| Drive system | Direct Drive |
| Maximum torque | 21 N·m (sustained) |
| Rated power | 360 W |
| Motor | Zero-cogging flat-wire |
| Encoder | 21-bit magnetic (2,097,152 PPR) |
| USB refresh rate | 1000 Hz |
| Input voltage | 110–220 V AC → 36 V DC |
| Housing material | Aluminium alloy |
| Rear cover material | Plastic |
| Coupler material | Aluminium alloy |
| RGB light strips | 2 |
| Quick Release | Supported |
| Mobile app control | Supported |
| Ports | Power, PC, pedals, dashboard, shifter, handbrake, emergency stop switch |
| Mounting | Bottom, front and side; optional adjustable bracket |
| Emergency stop switch | Optional |
| Dimensions | 248.8 × 140 × 135 mm |
| Weight | 9.0 kg |
| Platform | PC |
| Wheelbase box contents | R21 Ultra wheelbase, power adapter, power cord, data cord, bolt kit, user manual and warranty card |
Steering wheels available in the bundle
- ESX: aluminium rim, 22 controls and the official Xbox licence within the MOZA ecosystem.
- KS PRO: 300 mm butterfly format, lightweight and aimed at GT3 and open-wheel racing.
- CS PRO: 320 mm round rim, the most versatile choice for GT, touring cars and rally.
- GS V2P: 300 mm, forged carbon fibre, 10 programmable buttons and 5 rotary encoders.
- RS V2: forged carbon fibre and leather with RGB lighting, for GT and endurance racing.
- FSR2: 280 mm formula wheel with a 4.3" touchscreen, 10 backlit buttons and magnetic carbon paddle shifters.
- TSW: truck wheel, specific to Euro Truck Simulator 2 and American Truck Simulator.
- VGS: 2.85" circular HD touchscreen at 60 Hz with a customisable interface and 72 programmable inputs.
- Lamborghini ESSENZA SCV12: officially licensed replica of the SCV12 wheel.
- Porsche Mission R: officially licensed replica of the Mission R wheel.
Pedal configurations
- SR-P (2 pedals) + upgraded spring and damper kit: the entry point to load cell braking, with an adjustable progressive brake.
- CRP2 (3 pedals) + Performance Kit: second-generation pedal set with load cell and clutch.
- mBooster Active Pedal Set + CRP2 throttle + extended baseplate: active brake with dynamic force feedback.
- No pedals: if you already have a pedal set and only want the wheelbase and wheel.
Compatibility
- Platform declared by the manufacturer: PC.
- Simulators: iRacing, Assetto Corsa and Assetto Corsa Competizione, rFactor 2, Automobilista 2, the F1 series, DiRT Rally, RaceRoom, Le Mans Ultimate, Euro Truck Simulator 2 and American Truck Simulator, among others.
- Full MOZA ecosystem: sim racing wheels with MOZA Quick Release, pedals, shifters, handbrakes and dashboards connected directly to the wheelbase.
- Within the MOZA ecosystem the official Xbox licence sits in the ESX wheel, not in the wheelbase. MOZA does not offer PlayStation compatibility on any of its wheelbases or wheels.
- Configuration and firmware updates through MOZA Pit House and the MOZA mobile app.
Frequently asked questions
Is the 21 Nm of the R21 Ultra sustained or peak torque?
MOZA states the 21 N·m as sustained torque: the wheelbase holds its performance through long sessions without cutting force because of temperature, thanks to intelligent thermal management with real-time monitoring.
What is the difference between the R21 Ultra and the R25 Ultra TrueTorque?
Both share the zero-cogging flat-wire motor, the 21-bit magnetic encoder and the same force feedback algorithms. The R25 Ultra steps up to 25 N·m and adds a true torque sensor with 0.1% sampling accuracy and a response rate of up to 2 kHz; the R21 Ultra stays at 21 N·m as the more contained high-performance option.
What is a zero-cogging flat-wire motor?
It is a motor with flat-wire windings that increases copper density and virtually eliminates cogging torque. In practice the wheel turns with no perceptible steps and reproduces road surface detail more faithfully.
In which positions can I mount the R21 Ultra wheelbase?
It supports bottom, front and side mounting with an optional adjustable bracket, and measures 248.8 × 140 × 135 mm at 9.0 kg, so it needs an aluminium profile cockpit or an equally rigid structure.
What are the RGB strips on the wheelbase for?
They are two configurable strips with 16.7 million colours that can display real-time telemetry: ABS activation, traction control, gear shifts or flags. They are purely informative and can be switched off.
Buying your sim racing bundle from Simufy means buying with full guarantees
- Official premium sim racing distributor in Spain and Portugal — over 70 brands
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- Shipping from our own 5,000 m² warehouse and Barcelona showroom
- Specialised technical support and official warranty on every product
- Tailored financing: leasing and renting available
Frequently Asked Questions
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