6GX X-drive wheels setup

[lzyla]

Hello!

I am waiting for production of my 640 xd GC M-sport (placed an order already) and have a tough decision to make.
Originally the m-sport version could be equipped with the following wheels:
FRONT: 8,5 x20 ET33 - TIRES 245/35/20
REAR: 9X20 ET44 - TIRES 275/30/20
so it comes with staggered setup from factory.
I really like the look of the M5/M6 wheels and I would be happy to order mine with standard M-sport package 19" (to keep it for winter tires) and order the 20" M6 wheels for summer additionally.
My question is: Would that be fine to mess with the ET on xdrive ?
The RWD M5 wheels which i plan to order have :
FRONT: 9x20 ET32 - TIRES 265/35/20
REAR: 10x20 ET34 - TIRES 295/30/20
What do you think about such a wheels on xdrive version?
Would that cause any harm to the xdrive?
As far as I understand - the ET should have no influence on the rotation speed of the wheel? Would you recommend chossing different ET wheels (compared to factory's version) if i make sure that the rotation speeds are ok?
Would this ET difference have any influence on xdrive?
I'll be gratefull for your opinions.
Regards
Lukasz

SORRY FOR THE 2nd post. I made a typo in the thread's subject. PLEASE DELETE!!!

[cleanGC]

The offset of the M5/M6 wheels will not fit your Xdrive model. The wheels will stick out way too much. I have already looked into that option prior to getting my wheels. You can have a staggered wheel set up with the Xdrive as long as the rolling circumference is the same for the front and rear. If you must have the M5/M6 style rims they're cheap replicas out there that will work with your car. I highly recommend spending the extra money and have a set of wheel custom built for your car. That way you get the most aggressive fitment without having to worry about rubbing. Good luck!