I'm in the same boat.
I bought a set of Elbrus wheels from Tire Rack for my winter set 2 years ago and have been putting up with this ever since. After having vibrations out of the gate, I had them rebalanced 3 times, and ordered a second set of hub centric centering rings after complaining to Tire Rack. My car shudders above >60mph with a harmonic vibration that comes and goes. To me, that's indicative that the vibration is happening on multiple wheels (e.g. not just one out-of-balance).
So this morning after having my winters on for a week this season, I decided enough is enough. I got my calipers out and measured the hub-centric rings. My belief is that the rings that Tire Rack provides are the wrong size, measuring ~79.5mm on the outside--consistent with that the Tire Rack specialist told me the Elbrus outer bore size is. However, on the inside, I measure a whopping loose
68mm on the centering rings. Knowing the Audi B8 hub size is 66.6mm, this 1.5mm gap could explain why subtle levels of centrepital force applied to a 24 pound wheel at 65mph create noticeable vibrations.
Bottom line my hypothesis is that the Tire Rack centering rings are the culprit. Unfortuantely I can't find any 79.5mm -> 66.6mm centering rings. Looks like custom is the only solution here.
My research turned up a couple of shops (
here and
here and
here) that sell custom spacers. I spent $100 ordering a 79.5mm to 66.6mm metal spacer set...I'll keep the board posted on how this goes.
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