The MOZA R21 Ultra is a direct drive wheelbase designed for PC sim racing, providing a sustained maximum torque of 21 N·m. This level of power ensures consistent force feedback even during long endurance races without the need for torque throttling. It utilizes a zero-cogging flat-wire motor and a 21-bit magnetic encoder with a resolution of 2,097,152 PPR, which together deliver smooth and precise handling for competitive drivers. Built for stability and durability, the unit features an aluminum alloy housing and coupler, while the rear cover is made of plastic. The compact design measures 248.8 × 140 × 135 mm and weighs 9.0 kg, offering flexible installation through front, side, and bottom mounting options. For a personalized setup, it includes two RGB light strips and LED buttons, all of which can be managed via the MOZA App for configuration and firmware updates. To maintain peak performance, the wheelbase employs intelligent cooling with real-time temperature monitoring and torque regulation. Safety is integrated through a built-in Hands-off Protection system that stabilizes the wheel if you let go. The device is well-connected with a 1000Hz USB refresh rate and dedicated ports for pedals, dashboards, shifters, handbrakes, and an emergency stop switch, making it a comprehensive hub for an advanced racing cockpit.