I am exactly in the same boat. Not to Hijack your thread but I am based out of seattle and my intention was to move to staggered 19 inch setup with 225 in front and 255 in rear with Michellin A\S tires for all year. Was planning to keep the current ones in storage for lease return. I also have an XDrive and was wondering whether it is the smart thing to do. My current problem is, slightest of spirited driving in the wet makes the back step out. Although i like the fun of it but would rather have a bit more traction
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