I was going to go with 18" or 19" wheels for the winter tires, depending on the available sizes of the wheels I like.

Will I get better performance / traction by sticking to the 18"?

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2009 E70 X5 3.0, Monaco Blue / Tobacco Leather
Dark Burl Walnut / Sport / Premium / Technology / CA
Sirius / iPod / Comfort, Heated seats / Running boards
Ordered 5/29/09
Built: 6/10/09
Delivered: 6/30/09