Ickdeep,
Like most BMW models you can buy a "square" or a "staggered" wheel setup in either the rear wheel drive model or in the all wheel drive model. Just because you have a square setup does not mean that is all that is available. Look at the bottom left of the page of the 535ix manual (page 192) to see that a "staggered" wheel/tire is available for the 535ix from the factory.
