96 Buick park ave

Hi I bought 4 new tire had them balanced & front end aligned but ay 70 MPH it still shimmys any help Thanks JimH

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Diod it do this before, kinda important info left out.

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it's something else; but so often it is tires out-of-round. Ie., you can run a metal rod thru the center of a 4-sided(6-sided if you count all surfaces?)box, mount it on a tire-balance machine, and balance it perfectly, yet it will not ride smooth if mounted as a tire! And, yes, it can happen with ANY brand. HTH, s
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sdlomi2 wrote:

spotted by the person who did the alignment. If you do this, rotate tires frequently to equalize the added wear.
If it's tires, shoot for a replacement by the dealer. If that can't be managed ask if they do 'tire matching' This is an older process -- involves shaving some rubber from the shoulders of each tire in spots where the carcass is stiffer; then, rebalance. Might smooth things out.
--
PJ

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out-of-round. s
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