[rpms44]

Originally Posted by westwest888

The second setup has different tire diameters. You should *not* do that on the e90. Preserve the factory tire diameter which is 25.0 or 25.1 inches (depending on how you round).

235/40 18" all around is a great setup. Use the same rim diameter too. It will fit on an 8.0 or an 8.5 inch width rim.

The second setup would be the same front and back.
I guess it should be B1 or B2.
ie. B1-245/40-18 F & R on 8" wheelsOR
B2-255/35-18 F & R on 9" wheels.
I am trying to get as much tire as possible, and I am not sure if the front can take a 9" wheel with 40 offset
(I am looking at O-Z Ultrleggera black)
Looks like the square setup is the way most have gone.