I almost killed myself in a local parking lot my first year with my X5. Going downhill, I hit a small ice patch and the tires were like huge skis. The fact that I did not hit a person or an object was due to pure luck. I have the 19" sports wheels with diamaris. I knew I had to get snow tires but it was not time yet. It was so scary, I walked home that day. I replaced the tires the next day with a set of 17" wheels and Hankook Icebears. The ice bears are decent tires but they are really loud this year (2nd year of ownership). They also make a ton of noise at 80mph and over. I know I should not be going that fast on most days anyway.

YMMV

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Abster641