FURTHER INFO

Wayne - After reading your PM with the description of the condition, your shimmy sounds almost EXACTLY like the textbook example of the need for a dual-plane spin balance. I would check around for a shop that has a Hunter Ground Force balancing machine, or alternatively, a reputable tire shop, and tell them about the symptoms you're experiencing. I firmly believe a good dual plane balance by an experienced tire expert will resolve the issue. Do the fronts first, and see if that fixes it. While the tech is spinning your wheels and tires on the machine, have them look for excessive run-out (vertical motion caused by tire or wheel out-of-roundness). If everything balances okay, and you still have the shimmy after that, check to see if your wheels require a centering ring, which is a plastic or metal ring that fits inside the rear of the wheel bore to center the wheel on the hub center. If it requires one, and if it's missing, it will cause the wheel to not be centered on the hub, and consequently, it will vibrate. This does not, however, sound like what you have going on...it sounds like you just need a good dual-plane balance done on the fronts. Check it out and let me know what you find out. Good luck!

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