I mentioned aftermarket rims as a culprit but if you have AMGs which are hubcentric, you should be fine in that area.

Typically, wheels that are not "hubcentric" are difficult to mount perfectly against the hub. The result is that the wheel is ultimately fitted in an eccentric position...it's a small amount, but at speed, it manifests itself as a vibration, starting at around 45 mph, and then horribly after 60-65 mph.

I had hubcentric rings fitted with my aftermarket wheels after enduring the problem for many years, and the vibration immediately disappeared.

I would also look at the idler arm. Cheap part, and excessive wear will produce the vibration you are experiencing.

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