I should have come here for help 4 years ago, but here goes; this car is my wife's around-town car, with basically normal family-type driving, and averaging 10K-12K miles per year (currently 144,700 miles). It has 5-spoke wheels which I don't think were original, though they are factory wheels (tire size 225/55R-16); similar to the "M Parallet Spoke" wheels that Bavarian Autosport shows on their site. When we bought the car, Car Tender (great indy shop) in Seattle was trying to diagnose a front end vibration/steering shimmy that occurs at 45mph, then disappears as we speed up or slow down. The "sweet spot" for this is only about 2-3 mph wide. They had checked wheels, tires and suspension without success. This had continued occasionally after we bought the car. In May 2006 at 123K, we bought new tires at Les Schwab, with spin balancing, and the problem disappeared almost completely - until we had the tires rotated, and it started up again. We rotated back, and again almost disappeared. It has been liveable since then, until yesterday when we had our local mechanic replace brake pads on all 4 wheels. Tires were replaced on the wheels they had been on, but the vibration/steering shimmy is suddenly back with a vengeance, now starting at about 35mph, and going almost to 50 mph. After test driving the car this am, we rotated front to back again, and though a little better, still much worse than before, and still with the expanded "sweet spot" range. This happens both accelerating and decelerating. We've had the suspension checked to see if anything is loose or missing, without success, and a wheel alignment at 127K, with no discernable improvement or worsening. I am absolutely not mechanical, but between everyone who's looked at it, we are out of ideas. Has anyone run into this previously, so we can learn from your experience?