Vibration at highway speed

[A35ME]

Has anyone experienced an undiagnose-able vibration at highway speeds (65+)? I just swapped out the OEM Bridgestones Turanzas with Michelin Primacy, assuming the issue was the poor performance on the tires on my 08 Altima coupe 3.5 CVT.

There is a slight improvement, but still a vibration. It's not horrible, but enough to be irritating. Wondering now if there are issues with the CVT transmission, or less likely, is the spoiler I installed (the G35 lookalike) disrupting air flow sufficient to cause a vibration? I'm stumped and need help!

[bradz]

It's probably your tire balance.

[A35ME]

I'd love that it were simply balancing the tires. The OEM tires were rebalanced three times (including a road force balance) to no avail. The Michelins were installed over the weekend, and were spun balanced before installation. My guess at this point is that it's not the tires. Maybe the wheels, but not sure.

[vonivo]

your rotor could be warped

[A35ME]

Exposing my ignorance ... what's a rotor?

[bradz]

Check your center ring too. Maybe they forgot to install it.

[spockrock]

Exposing my ignorance ... what's a rotor?

The metal disc that your brake calipers squeeze to slow you down.