Anybody hear about Tourance's shaking & shimmying?? I need a new set of tires, replacing T-66's. Talked to dealer, he said they've had a few cases (did not say exactly how many. should have asked) of a new set of Metzler Tourance's at a certain speed start to develop a shimmy. When they replaced w/T-66's it went away. I told him I was surprised to hear this, as so many have recommended the Tourances. Including BMW. My thought is a bad batch... Anybody else experience this??