MOZA announces 21 and 25 Nm bases with a flat wire motor
Presented at Gamescom, the R21 Ultra and R25 Ultra use a winding technology taken from electric cars. MOZA announces 26 per cent higher torque density.
On 30 October 2025, MOZA Racing detailed two high-end bases presented at Gamescom: the R21 Ultra and the R25 Ultra True Torque. The manufacturer announces peak torque of 21 to 25 Nm and, more notably, a type of motor new to sim racing.
Flat wire winding, which MOZA says it takes from electric cars and aerospace, replaces round-section wire with a rectangular conductor. MOZA announces torque density 26 per cent higher than motors of comparable size, better heat dissipation and no cogging.
When this much torque becomes useful
Above 8 Nm, what the driver feels depends first on how stiff the mounting is. A 25 Nm base bolted to a desk that flexes passes on less information than a 12 Nm base mounted on an aluminium profile chassis. Torque of this order therefore assumes a rig, and the spending does not stop at the base.
The announced heat dissipation addresses a real issue: a base that heats up loses torque at the end of a stint, and endurance racing is where the difference shows.
What we are not saying
We have not tested either of these bases. The figures quoted are the ones MOZA publishes, and the 26 per cent gain is a manufacturer claim, compared with models it does not name.
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