Largest diameter tire to fit 550xi sport package

Asked by Jun 21, 2015 at 05:23 PM about the 2011 BMW 5 Series 550i xDrive

Question type: Car Customization

245  40 R19 tires and rims fragile. Will 245 45 R 19 or 245 50 R 18 fit on vehicle

2 Answers

If you have 245/40-19 now, going to 245/45-18 are virtually the same size. Same width and a total diameter of 26.72" (former) and 26.68" (latter with 18" rims. Only 0.04", less than 1mm . If you want to stick with 19" rims, you will need a aspect ratio of the same, 40 to maintain size. Going to 245/45-19 is very nearly a full inch bigger at 27.68" (0.96") and that may cause problems with other things. I am going to direct you to another thread the we went through this on a BMW, I will put it in a separate window to make it easy to hyperlink. Changind only a little caused a lot of problems. 245/45-18 is stock for the BMW 550i xDrive This is a different BMW ..just an example of what all we went through. Best to stay as close to stock as possible, and that is 245/45-18

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http://www.cargurus.com/Cars/Discussion-t24656_ds665437#msg460711

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