On 12/31 I purchased Continental True Contact Tour 91H tires for my 2017 Elantra SE. They were great until I got onto the interstate. It felt like the wheels were bouncing over 60 mph, but I felt no vibration in the steering wheel. It is hard to explain. I hear a sound that was not there before getting the tires. A busy sound. My first highway trip over 70 it seemed like it got better at higher speeds and was smoother. I just wrote to Continental and will call shop the that installed them tomorrow. Knowledge is power and I thank you in advance for helping me.