[RonMexico]

I just found out today that two of my HRE wheels are irrepairably bent. I'm done dealing with this shit. I want to fit taller tires that can handle the roads.

Michelin has PS4 SUV tires 295/40R21 111Y XL BSW.

My plan is to fit those on whatever new rims I buy unless I hear a good reason not to try. Possible that these tires on 21s are too big for the wheel well?

[pbonsalb]

40s on 21s is unlikely to work unless maybe you use narrower tires. I would go to 19” wheels with 40 series for a better ride on the F90 M5.

[LouK]

Stock 19's rear are 285/40/19 about 28"
Proposed 295/40/21 will be about 30.3
as Pbonsalb said I'm not sure you will be able to fit that on 21's.
What size are you currently running with the 21's?

[pmsteinm]

As others have said if you want more sidewall the 19" is your only option. A 21 plus larger sidewall will mess up the speedometer if it even fits. If you want SUV tires get an X5M

[pbonsalb]

X5M is not known to provide a smooth, supple ride.