[JensM]

Advise needed.
Got an X4 F26 30D 2015.
Need to have new winter tires - 19": 245/45 and 275/40.
Currently Pirelli Sottozero2 Runflat *marked (BMW approved).
I'm only going for premium tires and this leaves the opportunities quite limited having the size combo in mind - I can live with non-runflat.
Please note I'm located in Europe.

I have found this combo:
245/45/19: Pirelli W 240 SottoZero S2 runflat 245/45 R19 102V XL* (* = BMW approved - do only exist as runflat) @ 260Euro
275/40/19: Pirelli W 240 SottoZero S2 275/40 R19 105V XL MO (MO = Mercedes approved - this is a non-runflat) @ 194Euro

My question is: Tire pattern and technology seems same just one is runflat (front) and one is non-runflat (rear).
Will this be a problem for te Xdrive system?
- Or do I have to have same type in front and rear?
- The rear size in runflat cost hefty 431Euro each....so almost 500Euro extra...

Thanks in advance
JensM