Originally Posted by 2m3
If this is true that it will have front 245/40 and rear 265/40 , the rear has larger diamater than front. It is interesting to see how DSC, DTC, etc works on tires with different rolling per minute.
It is better if they have 245/40 front and 265/35 rear or 275/35 rear.
The reason for using taller tires in the rear is to be able to get a bigger tire contact patch, without the need to use even wider tires. It is not a bad thing to have! The Ferrari F430 has 225/35 fronts and 285/35 rears. Same aspect ratio for both axles, but with 60mm wider rears.
Regarding DTC, ABS, etc, they all work based on a signal from the wheel rotation sensors, which is then processed by the corresponding electronic module. By applying a correction algorithm, the information from the rear wheels can be easily adjusted by the BMW engineers.