Hello, I have the following problem, recently I bought myself a new set of summer guests. It is about 19″ with 215/35 19 Hankook Ventus tires. The tires were used but new. Shortly after the tires were mounted, a tire had a bump in the flank. I can exclude a curber etc.. Then I bought a new tire. This is the tire VR. Then again a week later the tire HR has a bump. Now my question e what is it? I can rule out a debt on my part! Are the tires too narrow. According to Hankook I have a release for the rim. Is the air pressure too high? I drive at the VA 3.5 bar and at the rear 2.9. All values of Hankook. I hope you can help me. MfG