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The 2015 didn't come with 20s. Do you mean the 437m 19s? Or did you put the 666m comp wheels on ?
I'd go with the 437m wheel as it will clear your brakes. I'm not sure an 18 would fit.
For year round tires I used the Michelin pilot sport AS3. Had them on my 335i and they handle light to medium snow accumulation fine. But still have enough grip to be fun in the summer.
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