The M Sport comes with summer-only tires. In order to contend with the lake effect snows we're exposed to here in southwest Michigan, I always outfit my vehicles with dedicated winter tires. For the X1, I have elected to mount 17" Michelin Pilot Alpin PA3's (non-staggered) in order to maintain the best handling when the roads are dry. I should be bolting them on sometime in the next few weeks.
http://www.tirerack.com/tires/tires....95&sortSize=17