How many miles do you have on your winters? What do they look like, and have you had any of the symptoms previously noted? Particularly if wear/wobble etc., and you have no history of an alignment on the vehicle and it has usual miles [what year is it? mileage?], you might want to have balance on the summers/4 wheel alignment when you have them mounted. All alignments are not the same. I had mine done at a shop with the proper equipment, name of which escapes me at the moment, for a reasonable price.

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.