In a similar situation as the OP, original runflats are done and looking for options. Living outside of Boulder, CO, my plan is to run dedicated winter tires but not sure if I should put them on my current 19" wheels and buy 20" wheels for summers or just another set of 19s. Any suggestions? Is there a big difference in performance between 20" and 19" wheels on a xDrive 35i? Anything else I should be considering?
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