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I just put my wheels on today and everything is fine except when I hit 60 MPH...The car starts to shake a little like they are out of balance....I know that they are balanced because the weights are on the wheels. Could it be the hub centra spacer things? I noticed that I didn't get these when I got my wheels...If so, can i get them at any tire place? Thanks in advance!!!

 
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Sounds like a Hub centerin ring problem. and Yes you can get a set at your local tire store, or at least you should be able to. I forget the sizes you need.

 
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The Car centerbore is 56.1 mm. The O.D. of the ring depends on the wheel.

 
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Thanks guys!!! I knew Boiler would know the centerbore...that was going to be my next question

 
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Have the balance of the wheels rechecked. My car rode fine, then I had the dealership I work at rotate the tires. I then had a vibration at 60-70+ mph. When I went to work the next morning and had them checked, the balance was off. They were rebalanced and then rode smooth again.

 
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"In theory" you can get away with no centering rings. Its tricky. But if you start with a torque wrench, and incrementally go across the lugnuts in the standard X pattern, increasing the torque each time, you'll get the wheel seated where it will roll true. But its tricky. So just go buy the centering rings.

 
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As long as I can get them at Kaufman tire, I'll be getting them tomorrow..I'll also have them check the balance while I'm there...Thanks for all the help guys