I totally agree with Romini, however in my case.. the hub rings that came with my Ichiba 20mm spacers played slightly within the wheel. I even posted videos of this.

I had a local shop fabricate new hib rings for me so they sit tight inside the wheel bore... the vibrations went away. But guess what? when re-installing the wheels, the tire shop did them manually in a star manner.

Then I took my car in to get the rotors replaced, and they re-installed the wheels using a gun, and guess what? Yeah you guessed it.. the vibrations came back!

I am now running on aftermarket wheels with no spacers... I still have shaking but that's becasue the tires are defective. I guess I have bad luck with wheel mods!!.

Ordered new tires! I plan on running 10mm spacers on my MRR's as well.

So Romin may be right.