Here's the sob story. I bought an 87 535is that had 528e rims on it. Had just enough money to get cheap 16x7 rims with Kumho 711 225/50's. Immediate front end shimmy/vibration. The rims are not hub centric, but Just Tires swore they would work fine. After playing around with wheel to hub alignment , the shimmy was acceptable. However, went to Shenandoah NASA event, car handled like a bus on hard tires. Bought 18mm wheel spacers, car handles much better, but shimmy/vibration is much worse. Before ponying up $800 for good rims, or replacing every possible suspension component that might be a problem, I would like to fit known good rims and tires of the same size or close to it, just for a half hour test to confirm or refute my suspicions. Just to be clear, this is the cars condition right now: new center link, idler arm, steering arm ball joint, Bilstein sport shocks, HR springs, and all else has been declared fit by a known BMW mechanic/
If anyone can help, I am in Fredericksburg, Va., will travel, buy lunch.