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MOZA is unusually clear about the R21 Ultra's output: its 21 Nm rating is sustained torque, not a short-term peak. The base can therefore place repeated high loads into the wheel mount throughout a long session. At more than 16 Nm but no more than 26 Nm, the R21 Ultra belongs in SIMGASM's Club tier only.
The SIMGASM Club is the minimum tier displayed for this wheelbase. It aligns the collection with the published 21 Nm figure without treating the R21 Ultra like a lower-output Hobby base. A complete, correctly tightened mounting pattern is essential because continuous output can expose play that a brief force spike might not reveal.
Drivers who regularly use the full setting should consider more than the classification threshold. The Sport cockpit adds useful reserve for endurance racing, strong braking hardware and chassis-mounted displays. The Pro cockpit is the long-term option for motion, a dense accessory layout or future hardware above the R21. Sport and Pro are fully compatible even though Club alone appears in this torque-filtered grid. For sustained maximum-force longevity and SIMGASM's guaranteed 100% flex-free platform recommendation, Pro is the safest specification.
The wheelbase supports more than one mounting orientation, but the SIMGASM bracket still has to match the exact interface. Compare Bottom Mount, Front Mount and Side Mount options, then select the correct mount variant for the R21 Ultra and your preferred steering position. Do not assume an older MOZA bracket or a visually similar R-series pattern is automatically correct.
The result is a focused recommendation: Club satisfies the 21 Nm class, while Sport and Pro address the demands of running that sustained output over the life of a serious rig.
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