Run flats was the first thing i changed on my car when I bought mine 7 years ago. Getting "normal" tires made the ride a lot more comfortable. The sidewalls on a runflat tire are to stiff. Get a mini air compressor, and a tire repair can, as a backup just in case of a flat tire, and go for "normal" tires instead of runflats.
I have 245/40-19 on Continental sport contact 7 on my 2013 520d touring.
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