Tires OEM BMW or Kormoran
Swapped my wifes Z4 from runflats to normal.
Pros: better ride, less likely to crack rims, cheaper tyres.
Cons: no spare tyre.
Before I switched I had 4 sidewall tears, one bent wheel, and one cracked wheel. $3000 in damage. After I switched, zero issues a year and a half later. Smoother ride and less road noise too.
My cheap Kormoran Snow (Michelin owned) works great in Sweden. Best results on snow, and good fuel economy not so great at the rest.
For better handling and winter traction, I would consider getting wider tires.
HD thrust arms are an improvement without too much sacrifice. Better shocks as well. I’ve found tires make a huge difference with the E39.
Narrow, low-profile tires aren't as forgiving over potholes, especially when riding on the 20" wheels.
Just be warned I bought new and we don’t drive it wild or anything but both rear tires (non staggered 21”) were at 3mm tread after 10k miles and I had to replace them. Was shocking.
The run flat tires are terrible. They feel like they are made of concrete and the grip is very lacking.
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