I would think getting a narrow tire for the winter is ideal as I'm pretty sure you have 20 inch rim on it now.
Also, it does usually cost more to take off the tire from the rim each time changing over as opposed to a single swap with a full set. Can also risk damaging the tire.
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2018 540ix msport
2015 X5 msport
2013 750ix msport
2011 550ix msport
2009 e92 335i msport
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