Originally Posted by paintpro21
No the 18x9" does not need spacers for caliper clearance. Its spokes are flatter, which results in better clearance:
Here is an 18x8.5" wheel with no spacer clearing a 365mm Brembo 6 piston monoblock kit on an E46 M3. The 18x9" wheel has a few millimeters more clearance behind the spokes then the 8.5" wheel.
great new update Eddy.
upgrading my brake is not a problem at all on my future list