Description

MOZA R21 Ultra Direct Drive Wheel Base

The MOZA R21 Ultra Direct Drive Wheel Base delivers a professional-grade racing experience through advanced engineering, powerful torque, and ultra-responsive feedback technology.

Featuring a sustained 21Nm high-torque direct-drive motor, zero-cogging flat-wire construction, and a high-resolution 21-bit magnetic encoder, the R21 Ultra provides precise control, smooth force feedback, and exceptional realism for both endurance racing and competitive driving scenarios.

Its refined CNC-machined aluminum housing, customizable RGB lighting, and intelligent thermal management ensure durability, style, and stable long-session performance.

Designed for universal rig compatibility and supported by a next-generation force feedback algorithm, the R21 Ultra is engineered to deliver uncompromised accuracy, responsiveness, and immersion at every turn.

Product Features

Product Features 

What's Included

What’s Included

• MOZA R21 Ultra Direct Drive Wheel Base × 1
  
  

• Power Adapter × 1
  
  

• Power Cord × 1
  
  

• USB Data Cable × 1
  
  

• Bolt Kit × 1 (mounting hardware)
  
  

• User Manual (printed or digital)
  
  

• Warranty Card

Product Specifications

Product Specifications

General & Performance

Construction & Design

Connectivity & I/O

Physical

Getting Started Guide

Getting Started Guide

1. Unbox and inspect

    

   • Remove the R21 Ultra, power adapter, cords, and bolt kit from the box.

   • Check the housing, shaft, and ports for any visible damage before installation. 

    

2. Verify your rig and mounting point

    

   • Make sure your cockpit or wheel stand supports front, side, or bottom mounting and is rated for high-torque DD bases (21 Nm).

   • Confirm mounting holes align with the R21 Ultra’s pattern (you can reference the mounting holes diagram linked on MOZA’s site). 

    

3. Decide on mounting orientation

    

   • Choose front, side, or bottom mounting based on your rig layout and preferred wheel height/angle.

    

4. Attach the base to your rig (test fit)

    

   • Position the base on your bracket or deck and loosely install bolts from the supplied bolt kit.

   • Adjust tilt and distance, then tighten the bolts evenly.

    

5. Connect power and USB (PC)

    

   • Plug the power adapter into the base and then into a reliable wall outlet or surge protector.

   • Connect the USB data cable from the base to a USB port on your PC. 

    

6. Connect MOZA peripherals

    

   • If applicable, plug your MOZA pedals, shifter, handbrake, and dashboard directly into the base’s ports to simplify wiring. 

    

7. Install MOZA Pit House (PC)

    

   • Download and install MOZA Pit House from the official MOZA Racing site.

   • Launch Pit House and confirm the R21 Ultra is detected. 

    

8. Update firmware

    

   • In Pit House, check for firmware updates for the base and apply them if available to ensure latest FFB features and stability.

    

9. Initial FFB and safety settings

    

   • Set a reasonable maximum torque for your first drive (you can start lower if you’re new to 20+ Nm bases).

   • Confirm Hands-off Protection is enabled and any emergency stop switch (if installed) works correctly. 

    

10. Configure in your sim

     

    • Select the MOZA base in your sim (e.g., iRacing, ACC, F1).

    • Load or create a profile, set wheel rotation, and tune FFB strength to your liking.

    • Take a short test session to confirm everything feels natural and stable.

     

Product Installation Guide

Product Installation Guide

1. Plan your mounting method

    

   • Check your cockpit manufacturer’s recommendations for high-torque DD bases.

   • Decide if you’ll use front mount, side mount, or bottom mount (MOZA also offers optional adjustable brackets if needed). 

    

2. Align mounting holes

    

   • Line up the R21 Ultra’s mounting holes with your rig’s bracket or deck using the official mounting holes diagram as reference.

   • Use the included bolt kit where possible; if substituting hardware, match thread size and grade. 

    

3. Secure the base

    

   • Install bolts loosely first, then incrementally tighten them in a cross pattern to avoid stressing the housing.

   • Confirm there’s no movement or flex when you apply steering force.

    

4. Cable routing & strain relief

    

   • Route the power cord and USB cable away from the steering column and pedal area.

   • Use cable clips or zip ties to keep cables from snagging during wheel rotation or under your feet.

    

5. Attach steering wheel (MOZA ecosystem)

    

   • Install a compatible MOZA wheel via the MOZA quick-release system, making sure it clicks and locks in place.

   • Gently pull and twist to confirm there is no play at the hub.

    

6. Connect peripherals to base

    

   • Plug pedals, shifter, handbrake, and dashboard into their corresponding ports on the back of the base.

   • If you have the emergency stop switch, connect it to the dedicated port and mount it within easy reach. 

    

7. Power up and detection

    

   • Turn on the base and PC.

   • The base will run its startup sequence; keep clear of the wheel during calibration.

    

8. Configure in MOZA Pit House

    

   • Open Pit House, confirm the R21 Ultra is recognized, and run through initial setup.

   • Set operating torque, rotation range, damping, friction, and FFB gain.

   • Create separate profiles for different sims or car categories (GT, open-wheel, rally, etc.).

    

9. Enable telemetry and RGB behavior

    

   • In Pit House, configure RGB strip behavior—e.g., ABS pulsing, shift lights, flags, or simple static color.

   • If you prefer a clean look, you can dim or fully disable the lighting. 

    

10. Final checks and test drive

     

    • With the car stationary, turn the wheel lock-to-lock and verify there’s no rubbing or interference.

    • Test FFB at moderate strength first, then gradually increase if you’re comfortable.

    • Re-check all bolts and cables after your first few sessions.

     

Product Manual and User Guides

FAQ's

Frequently Asked Questions 

Q: Is the R21 Ultra’s 21 Nm torque rating sustained or just peak?

A: It’s rated at sustained 21 Nm, not a short peak spike. That means the base is designed to deliver full torque continuously, even during long endurance races, without stepping down due to heat. 

Q: Who is the R21 Ultra best suited for?

A: 21 Nm sits in the upper mid-range of DD wheel bases—stronger than most 3–12 Nm entry/mid units but more manageable than ultra-extreme flagships. It’s ideal for serious sim racers and league drivers who want high, sustained torque and detailed FFB without going to the very highest power levels. 

Q: How is it different from smaller MOZA bases like the R5 or R9?

A: Compared to earlier MOZA bases, the R21 Ultra adds:

• Much higher sustained torque (21 Nm)

• A zero-cogging flat-wire motor

• A 21-bit magnetic encoder for more precise position tracking

• A new FFB algorithm (NexGen Force U1) running on a 600 MHz CPU

• Improved thermal management and refined RGB design

In practice, that means smoother FFB, more detail, and more consistent performance over long sessions. 

Q: How good is thermal performance and long-term durability? Are there safety features?

A: The R21 Ultra uses intelligent thermal management with temperature monitoring and torque regulation to keep the motor in its ideal operating range. It also includes Hands-off Protection, which automatically recenters and stabilizes the wheel if you let go, adding a layer of safety with high torque. 

Q: Do the RGB lights or mobile app affect performance? Can I turn them off?

A: The RGB strips are purely cosmetic/telemetry-driven and do not affect FFB performance. You can fully customize or disable them in MOZA Pit House. The MOZA mobile app is used for configuration and firmware updates; critical FFB processing runs on the base itself, not in the app. 

Q: Is the R21 Ultra compatible with consoles?

A: The R21 Ultra is specified as a PC platform wheel base. Console compatibility is not advertised; customers using Xbox/PlayStation should refer to MOZA’s console-ready bundles (like R3 Xbox) or check official MOZA documentation for any future console support. 

Q: What do I need in terms of a rig to handle 21 Nm?

A: You’ll want a sturdy cockpit or wheel stand designed for direct drive bases. The R21 Ultra supports front/side/bottom mounting; MOZA and third-party manufacturers provide compatible brackets. Avoid lightweight desk clamps at this torque level—flex or movement will reduce FFB fidelity and can be unsafe.