[diesel86]

I am not an expert on the xDrive suspension and how it differs from the measurements of a RWD car, but your sizes and offsets are pretty conservative so I wouldn't guess you'd run into any issues with rubbing unless you decide to lower the car eventually. I don't know what the offset is on your stock wheels, but am willing to bet they are pretty close to my sportline wheels, i.e. ET34. So that being said, an 8.5" rim with an ET35 should have no problem fitting especially with a 235/35 tire. The rear is pretty much the same story. With that offset, I wouldn't expect to have any problems with an 9.5" rim

I'm planning on running an 18x8.5 with an ET 30-35 on all 4 corners shod with 245/40-18's.