[BrntRubber]

Hi All,

I am ordering a custom set of wheels but as the f90 has a Xdrive, the tyre sizes need to be within 1% difference in rolling radius for X drive vehicles to not cause errors in the system.

The shop ordering the wheels says the below is the ideal:
21x9.5 with a 255/30 R21 front wheel
21x11.5 with a 305/25 R21 rear wheel

Can anyone confirm or advise?

Thank you