It's already been said, its the wheel or tire if the balance is right. Although I will say some tires just suck. If you read some reviews on tire rack you'll see a few tires that are just insanely quite and smooth. The conti DW comes to mind. The oem tires I had sounded like a mud tire and didn't feel smooth. Although I never checked if the tires had been deflated from 60psi from Nissan.
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13 370z-
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