My car came with square setup but much smaller wheels than the stagger setup. 255/55-18. They have nearly identical rolling circumference as the 235/65-17 spare works nice that way.

I push the 255s pretty hard in the corners and don't feel the need for wider tires but I have the 3.0 it's a big difference.

I'm about to rotate my wife's tires front to back because of cupping on the front due to worn thrust bushings.

That being said: what are the current rim/tire combinations: are the wheels different tires same that you could swap front and rear tires if dismounted? Walmart will swap a tire for $10

Do you have directional tires? If not you can swap left to right.

If you do have directional tires and different size you can rotate left to right for $40 at Wal-Mart. I used to do that at least once on my Camaro during the life of a set of tires. They were square but directional so to chew up the other edge I would swap left and right front at least once by swapping rims.

I would recommend the same just like the previous post don't mess with a good thing just work within the rules.

If you pick a non directional tire you can rotate left-right a couple times then after say 10-15,000 miles swap rims so you can wear opposite sides of the tires.

It'll save money over the long run and be less work

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)