I have 19" 245 & 275 as summer wheels and winter wheels are 245 / 245 19". The thing is, 245 square setup is much better in terms of "shimming". Using 275 on back wheels, the car tends to pull to all directions much easier on uneven surfaces than with my 245 winter wheels. Also 245 are less noisier for some reason.. maybe because the contact area is smaller?
I'm thinking to get 245 square setup for summer too.
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