Tires OEM Mazda or OEM BMW

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.

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.

Tires make more difference than anything. I too bought at used Mazda 3, and thought: "Oooh, this is dodgy in the rain . . ."

Then I got better tires (summers and winters) and realized: "Ohhh, I just had terrible tires."

+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.

It was a commonly traversed dirt road, a little soggy after a rain storm and I backed my dad\u2019s brand new 2008 335i into a small mud depression with the right rear only. Result? Absolutely dead immobile

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