Join Date: Dec 2001
Location: Belleville, Illinois
Thanked 22 Times in 17 Posts
Re: low speed vibration. Ideas?
Also, it's not uncommon to have the belt in a radial tire not running exactly straight around under the tread - a manufacturing defect. Even though the tire looks fine, and will balance OK, when it is rolling with weight on it, the uneven belt makes the tire want to squirm side to side. Sometimes you can even hear it if you drive slowly on a very smooth surface. It makes a very rubbery sounding squeak, squeak, squeak, I think twice per revolution, but it could be only once.
At some speed that effect matches up with a natural harmonic frequency of the steering, and generates a shake. Usually it's a lower frequency, and happens at a lower speed, than an imbalance shake. And it can cause cupping.
The tire can't be repaired or balanced so it doesn't do it, although moving it to the rear will minimize the ill effects.
I have gotten several like that over the years. The tire dealers have told me that had I brought it back in the first month or two, they could have replaced it under warranty. Now, of course it's too old and has too many miles. My impression, though, is that it doesn't show up in a new tire. Maybe because the thicker, stiffer tread masks the problem.