My BMW 520D sport has continental sport contact 2 tyres fitted which I am told are not run flats, is this so?
Indeed, the ContiSportContact 2 does not exist in a run flat version. For your vehicle, there are "square" mounts in 18 inches (i.e. the same sized tyres at the front and the rear) such as the 245/40 R 18 93 Y. However, to confirm this dimension is compatible with your vehicle, please check your maintenance log.