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the speed is calculated by counting the "clicks" coming from the speed sensors and it takes into consideration the difference in speed between the front/rear and left/right wheels... if you manage to spin one of the wheels, your speedometer will still show 0 MPH (kmh), as the other 3 wheels are not spinning... not like old cars where you could get 100 MPH just by spinning in the snow/sand.
the number of clicks that used per mile for the odometer and digital speedometer are different from the number of clicks for the same mile in the analog speedometer - those values are specific to the car trim and theoretically can be changed in NCS Expert - i just have not heard of anyone in BMW world doing that, but supposedly someone in VW had done so...
there are threads that have specific values (number of clicks)posted somewhere here...
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