Hello guys, after the installation of my new Goodyear Ultra Grip 8 (205/55 R16) winter tires, especially at high speeds, a clear vibration was noticeable in the whole body as well as in the steering wheel. After a long time trying around and numerous balancing processes I looked at the tread of the tires once more. And look here: three out of four tires have a slight bump on the tread at one point. It makes the impression as if at this point too much mat Has anyone had similar experiences or experienced something like that before? My tyre dealer has offered to send me the tyres to Goodyear. In case of a manufacturing error I would get my money back. The problem is that I would not get any spare tyres from the dealer in the meantime and the winter is getting closer. Is not the dealer obliged to replace the tyres as part of the warranty if there is actually a problem with it?