rhythmic vibration at certain speeds on new wheels and tires? - Page 2
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  1. #11
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    Quote Originally Posted by Cooper View Post
    Move the tires front to back and see if it changes anything. My guess is tire balance or tread separation. Could also be a bent wheel.
    This! Vibration w/o feeling it in the wheel would probably indicate back tires out of alance/flatspot. See if you can feel something different in the steering wheel after moving the back tires up.

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    Not sure if the ST has the same issue, but the Miata does. It is so common there is a name for it, 65 MPH Shimmy. It even takes a special machine to get it all out as 'normal' balancing machines aren't sensitive enough to get it all out. If you see a difference call around and find a Hunter Road Force machine have your tires balance on that.
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