Tires OEM BMW or Barum

Regarding the X3M - I have about 9 months and 6k miles or so dailying mine. It is firm but I don't believe it's as punishing as most reviews mention. The thing is a monster man. I don't know why anyone would need anything more in a daily. It handles easily as good as my RS3 did and maybe even less body roll despite being much higher CoG and the RS3 didn't roll much either. It feels direct and definitely feels rear driven.

Awesome bike, but swap out the stock tires asap.

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.

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.

Had them in 245/45r18. Really comfortable, fuel efficient, good grip but average feedback. I was really happy with them until i had to do an emergency brake and the car just kept going. Afterwards I went and read tyre tests and all tests confirmed that their braking is horrible both in dry and wet.

They are dangerous in emergency situations

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