Team RCC is using the Speed 900s with 2 gear ratios and different wheel sizes.

4.5-1 and 6-1. Both MSR gearboxes with KOS ali gears in/on the wheels.

But the immense torque- 1.1Nm on 12V 51amps makes that you cant get that power to the ground with a 4.5-1 gearing in a 130mm wheel.
What gives a theoretical top speed of 36km/h. Wheelspin galore. Powerslides all over.