Need Info on Stock C300 Tires
This is my major concern:
Cups or scalloped dips appearing around the edge of the tread on one side or the other, almost always indicate worn (sometimes bent) suspension parts. Adjustment of wheel alignment alone will seldom cure the problem. Any worn component that connects the wheel to the car (ball joint, wheel bearing, shock absorber, springs, bushings, etc.) can cause this condition. Worn components should be replaced with new ones. The worn tire should be balanced and possibly moved to a different location on the car. Occasionally, wheels that are out of balance will wear like this, but wheel imbalance usually shows up as bald spots between the outside edges and center of the tread.
There are several discussions to be had about what tires will best suit you, but look to tirerack.com or other high-quality, high-volume distributor. On tirerack, spend a good bit of time reading the Survey Results and Tire Tests tabs, which are on the left of the home page to first determine which category of tire you want, then read the results and consumer ratings on individual brands and models. Good luck!

https://mbworld.org/forums/wheels-ti...s-5-miles.html
I any case, it looks like need to replace rear tires and get and allignment. I will be furious if it turns out to be a suspension component, bearing, or bushing. If thats the case there will be no way to recoupe my money for new tires.
I talked to my MB service tech and he said they checked everything on the car.
You didn't say whether or not that you visually confirmed that the tires were scallolped.
Since the noise also appears at low speeds, I'm wondering if its the tires at all? (scratch head)
Does anyone know if the rear end of our C300s have adjustments that are performed during a front end alignment that might account for a scalloped condition??



