I got a 6th gen sedan, I4, auto, and a few weeks ago I got 17" rims/tires plus Eibach Pro Kit. My wheel vibrates at about 50 mph and continues till about 75mph and then kinda stops!!!! I've had an alignment done, and had the wheels balanced and rotated as well now. It still is doing it! what the heck can the problem be??!?? Could it be the tires themselves? I don't believe the rim is bent cause they'll tell you if it is before they balance them and also if it was bent, i'd be feeling the vibration at all speeds. so guys help me out, i can't seem to figure out what the hell is wrong! thanks!