Wheel size for off road tires

[TPIT100]

Hi everyone. I have done a little research here looking for links to what is probably an old question, and not had much luck finding the answers I need. I just bought a 2003 x5 4.6is. It only has 30k on it! I live in Wyoming where there is snow on the ground 6 months out of the year. I am not having much luck with the stock wheels and tires in the snow (to say the least), so I am looking for a winter/off road set. I want to find some 17" bmw rims and put B.F. Goodrich all-terrain TA tires on them. I can use them in the snow, and for mild off-roading, as there are lots of unpaved roads here. Like having an extra pair of hiking boots. Now for the question. Will 17" oem bmw rims fit over the 14" disk brakes of the front of my 4.6 is? Has anyone had any luck with minus sizing for winter tires? Any information would be appreciated.