Tires OEM BMW or Hifly

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.

+1 used those on my e90 BMW last year during the 'record' snowfall and the were great.

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.

Got a bump on the sidewall of my right tyre after couple days and I haven't drove the car. After 2 days the right front started getting the same bumb on the sidewall of my tyre.

The run flat tires are terrible. They feel like they are made of concrete and the grip is very lacking.