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I use square 245/50-18 tires on stock 2018 740 rims on my 2018 640M Sport GT. They are take offs a stock 2018 740 and the 640 GT is similair in weight and length. I use the same setup for my snow tires. Honestly I think they are fine. It is the standard size these cars come with per the factory. They ride comfortably and match the cares luxury ride quality in my opinion. I also have a set of 245/45-19 wheels but they are not as smooth or responsive on the roads I drive. They are exactly the same outer dimensions.
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