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I attributed it to hitting a chug hole and bought another. Then reviewing these S Forums I noticed a thread on 'bubbles' on tires, which makes me wonder what caused the bubble. The heat near Phoenix was 100*.
I found these 20" wheels with the tires mentioned in your post, to be much quieter than the traded in '14 CL550. I used a decibel meter to determine that. The S Coupe was a good 3-4 db quieter at 80 mph. Something on the order of 63-65 db quiet vs the 67-69 db in the CL. I was/am surprised that run flats could be this quiet.
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