2 More Things To Consider...
Running your nice, new 20"s in Winter conditions exposes them salt and sand and, the will cause aesthetic degradation pretty quick. Running a low-cost set of Winter rims and tires will preserve your OEM wheels.
The 20" tire sidewall is pretty shallow and doesn't provide much protection from potholes and curbs which can be difficult to see in Winter driving conditions.
I run 18"s on my M40i in the Winter. Comfy with all-star Winter traction. If I damage one on a pothole it's about $160 to replace it. Handling is plenty good-enough for the Winter.
YMMV...
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