MOZA R21 Ultra 21Nm Direct Drive Wheelbase

MOZA R21 Ultra — 21Nm of sustained direct drive torque for sim racers who want substantial force-feedback headroom, smooth motor response and consistency through demanding races. It is a premium step beyond mid-range wheelbases without suggesting that the steering must be excessively heavy to be enjoyable.

The R21 Ultra combines a high-density flat-wire motor with very low cogging, a 21-bit magnetic encoder, a 600MHz processor and MOZA's NexGen Force Feedback Algorithm U1. The result is designed to reproduce delicate changes in steering load as well as stronger forces, with extensive tuning through MOZA Pit House.

Native iRacing 360Hz force feedback and Wheel LFE, dual customisable RGB strips, intelligent thermal management and flexible front, bottom and side mounting round out the package. The base works with compatible MOZA wheels and peripherals, making it a strong foundation for a high-end simulator.

UPSHIFT cockpit recommendation: for a 21Nm wheelbase, choose our R-MAX 160×40 aluminium-profile cockpit and suitable secure mounting hardware. Windows PC is supported; Xbox functionality requires a compatible officially licensed MOZA ESX steering wheel, and PlayStation is not officially supported.

Steering wheel, pedals and cockpit are sold separately. See the separate technical specification table further down the page.

21Nm Sustained Torque and Force-Feedback Headroom

MOZA rates the R21 Ultra at 21Nm of sustained torque, not simply a momentary maximum figure. This makes it particularly interesting to endurance and competitive sim racers who want strong output available through long sessions. Its thermal-management system monitors operating conditions and helps regulate performance as the motor works.

However, you do not need 21Nm of resistance in every corner. A powerful motor producing your preferred 8–12Nm steering weight has plenty of reserve for short peaks from kerbs, changing tyre loads and high-speed corrections. That reserve may reduce the likelihood of reaching the wheelbase's hardware output ceiling, although excessive in-game gain can still cause software-side clipping.

For perspective, the MOZA R12 V2 provides 12Nm, while the R16 Ultra offers 16Nm sustained and an optional software-enabled higher peak. The R21 Ultra's principal advantage is its additional sustained reserve, rather than an obligation to run a heavier wheel. Our force-feedback buying guide explains why headroom matters.

Why Choose the MOZA R21 Ultra?

The R21 Ultra combines high output with refined control. Its most useful features include:

• 21Nm sustained direct drive torque: generous reserve for demanding driving and strong momentary feedback effects.
• High-density flat-wire motor: designed to reduce cogging and provide a smooth response around the centre.
• 21-bit magnetic encoder: 2,097,152 positions per revolution for accurate steering-position measurement.
• 600MHz processor and NexGen Force U1: responsive, configurable force-feedback processing.
• iRacing 360Hz FFB and Wheel LFE: additional supported steering and tactile feedback detail.
• Intelligent thermal management: real-time monitoring and regulation for demanding sessions.
• RGB lighting and flexible installation: two customisable strips, with bottom, front and side mounting options.

High-Density Flat-Wire Motor

The R21 Ultra uses MOZA's newer high-density flat-wire direct drive motor, developed to deliver strong torque while minimising cogging. Cogging is the faint magnetic stepping or resistance you may notice as a motor rotates; reducing it helps preserve light steering sensations rather than letting the motor's own magnetic behaviour dominate them.

A 21-bit encoder measures wheel position at 2,097,152 points per revolution. Combined with the 600MHz processing system, this gives the force-feedback controller precise information for responding to small steering changes and more demanding corrections. Encoder resolution and processor frequency are important specifications, but they are not standalone guarantees of feel: motor behaviour, software and game feedback also matter.

MOZA's intelligent cooling and real-time temperature management are designed to maintain consistent performance during longer races. For an endurance-focused driver, smoothness and sustained output are arguably more meaningful than using the full 21Nm merely because it is available.

Native iRacing 360Hz FFB and Wheel LFE

The R21 Ultra supports iRacing's 360Hz force-feedback mode with suitable wheelbase firmware and MOZA Pit House software. More frequent force updates can help convey changing steering loads and transitions with greater fidelity in a supported configuration.

MOZA also documents support for iRacing Wheel LFE, which allows compatible low-frequency game effects to be sent to the steering system. These effects can be adjusted or disabled if they introduce unwanted vibration. MOZA's support guidance lists base firmware 1.2.5.5 or later and Pit House 1.3.1.50 or later as minimums for the features; newer releases may be available.

These are specific iRacing capabilities. Other games may provide different telemetry, force-feedback update rates or configuration options.

NexGen Force Feedback Algorithm U1

MOZA's NexGen Force U1 algorithm works with the R21 Ultra's motor and encoder to shape the final steering response. Through MOZA Pit House you can adjust overall strength and the feel of friction, damping and response, rather than treating maximum torque as the only setting that matters.

For example, drivers may prefer light, lively steering for one car and more damped, weighty behaviour for another. Proper tuning can also help prevent clipping and avoid unwanted oscillation. The goal is to feel useful changes in grip and steering load—not simply to make the wheel as difficult to turn as possible.

Customisable RGB with Telemetry Lighting

The CNC-machined aluminium housing incorporates two customisable RGB light strips with a palette of up to 16.7 million colours. They can be matched to your cockpit or switched off for a more understated appearance.

With supported telemetry and software configuration, lighting effects can indicate events such as ABS intervention, traction control, gear changes and race flags. Exact indications depend on the game, supported telemetry and selected settings. The lighting is a visual feature and does not add torque or force-feedback processing power.

MOZA Pit House and Hands-Off Protection

MOZA Pit House provides wheelbase configuration, firmware updates and force-feedback tuning on Windows PC. MOZA also provides supported mobile and cloud-linked configuration functions, giving owners more ways to manage their setup without changing the motor hardware.

The R21 Ultra additionally includes Hands-Off Protection, designed to stabilise the steering system if you release the wheel. For a 21Nm base this is a welcome safeguard, although it is not a substitute for secure mounting, sensible torque settings, an accessible emergency-stop arrangement where appropriate and keeping hands clear of unexpected movement.

Compatible with the UPSHIFT R-MAX

The R21 Ultra measures 248.8 × 140 × 135mm and supports bottom, front and side mounting, using compatible mounting hardware. Its housing is predominantly aluminium alloy, with an aluminium coupler and plastic rear cover.

At 21Nm, our recommendation is the UPSHIFT R-MAX Black Edition, with its substantial 160×40 base and 120×40 uprights. It is the more appropriate platform for high-torque wheelbases, demanding pedal sets and potential future upgrades. Confirm the wheelbase's specific fixing pattern and the chosen wheel plate or bracket before installing.

Our R-PRO 80×40 is a particularly good match for lower-torque wheelbases, and its optional Brace Kit extends its suitability towards the upper end of its recommended range. For an R21 Ultra installation, however, we would choose the greater rigidity of the R-MAX.

MOZA's Expanding Ecosystem

The R21 Ultra is compatible with supported MOZA quick-release steering wheels, from formula and GT rims such as the KS Pro and FSR2 to round wheels such as the CS Pro. Compatible MOZA pedals, shifters, handbrakes and dashboards can also be incorporated into a larger setup.

This flexibility is part of the appeal of buying a premium wheelbase: you can change wheel rims and disciplines without necessarily replacing the direct drive motor. Always verify wheel and accessory compatibility for the exact device generation and platform before purchase.

If your priority is balanced performance rather than maximum reserve, the R16 Ultra is worth comparing. The R21 Ultra makes most sense when its extra sustained torque, endurance headroom and higher-end installation genuinely suit your needs.

Racing Game and Platform Compatibility

MOZA lists compatibility with a broad range of Windows PC racing simulations, including iRacing, Le Mans Ultimate, Assetto Corsa, Assetto Corsa Competizione, Assetto Corsa EVO, rFactor 2, Automobilista 2, RaceRoom, EA SPORTS WRC, DiRT Rally 2.0, Forza Motorsport, Project Motor Racing and supported F1 titles. Some games require initial control mapping or force-feedback configuration in MOZA Pit House, and individual telemetry and special effects vary by title.

Ports on the R21 Ultra include power, PC, pedals, dashboard, shifter, handbrake and an optional emergency-stop switch. The wheelbase alone is sold without a steering wheel, pedals or cockpit.

Platform Support

• Windows PC: officially supported.
• Xbox: compatible configurations require the officially licensed MOZA ESX Steering Wheel, purchased separately; the R21 Ultra wheelbase alone does not provide Xbox support. Check individual game and peripheral support.
• PlayStation: not supported.

For product-specific compatibility and installation advice, please contact UPSHIFT before ordering.