This is the deal while I was in Wicita falls I had Discount tire put on 4 new Kumho ecstas on my car. I know they arent the best but Im buying a home so funds are limited. Anyway on the way home in Lousiana, I noticed a vibration under the drivers seat and up through the steering wheel going about 70 mph or faster. It doesnt do it at lower speeds around town just at highway speeds. Im thinking I have an imbalance in a wheel somewhere. It didn't do it when I had my Pirelli SuperSports on there so Im going with the most simple explanation. Another thing the tires themselves seem to have a greater gab inbetween the wheel and the tire, more so than my old tires. Is this normal?