Well I said I couldn't be ersed but things left up in the air bug me so..
Average car tyre would likely be more than 17" but we will use that to be on the safe side.
So dia would be (in metric) 431.8mm or 0.4318m
Circumference would be 1.356m
So at 18,000rpm that would be 24,405m/min or over 900mph.
I think
Yes they are geared down but it's a fixed ratio. Can't find much on the net but perhaps 6:1.
Still incredible though that the motor produces max torque st zero revs but goes up to 18000rpm.
