My 2011 X5 with sport package came stock with 255/50 19's all round. I want to upgrade to 20's. I have a set of staggered 20" rims, 9X20 for the front, and 10X20 for the rears. What is the recommended tire size? I want to keep the same diameter as stock so as not to affect the speedometer reading. Any suggestions?

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Run flat tires? Nein Danke!!!