[colson79]

My X3 came with the 19" wheels but I chose to go with 18" wheels for my winter set. I am running 245/50R-18 Bridgestone Blizzak WS70 XL tires on 18x7.5 Breyton Race GTS wheels and the setup worked great last winter. Order the compete set from tirerack as well.

There was a post last year from a guy who deviated from the standard size and was getting xdrive system errors, so you might run into the same issue if you go with not standard tire sizes.