Speedo will be off. They are like motorcycles set to display high. There is a great tire size calculator online app you can calculate the additional error. If you cHange all tires to a different size the car will not know it will just think you are going a different speed.

You can instantly introduce instant problems when you change tire width by changing the center of lift: you will flip which way the bearing is stressed and could instantly have 4 bad bearings. (Ask me how I know)


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