The wheel have a 14 inch diameter tire. The perimeter of the wheel is ~1.12 meters (measured with inflated tire and without anyone on top of the EUC).

The generic EUC motor have 51 coils and 46 magnets. It also have 3 hall sensors. For each full rotation, each hall sensor signal will have a transition state of 21.8ms (1s/46 = 0.02174).

Pictures of a generic EUC motor

This pictures were taken by Jayjay23 that wrote:

Opening it is not so easy though, as the ball bearing is pressed onto the axle and into the black shell.