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I have been running M5 wheels on my 2013 BMW 550i for the past 2 1/2 years. I got the wheels off the brand new M5 in 2013 right when I bought my car new. I have 255/35/20 on the front and 285/30/20 in the back. I had to use spacers in the front with longer lugs and rear didn't need them. My first set of tires were Michelin Pilot Super Sports and I got 13K miles of them. I am currently using Continental Extreme Contact DWS tires and they are great.