Some Hyundai Elantra owners report experiencing vibrations at speeds of 65 mph or higher, often attributed to unbalanced wheels, which can cause the steering wheel to wobble or vibrate. Additionally, a bad or blown shock absorber, particularly in the right rear, may lead to significant vibrations and noise at highway speeds. Some owners find that alignment and balancing issues persist even after being addressed, resulting in continued vibrations despite having new tires and a balanced front end. In certain cases, vibrations may remain unresolved even after alignment and balancing measures have been taken. For a more effective solution, some owners consider road force balancing for wheels and tires to mitigate shaking problems. If vibrations continue, it is advisable to investigate these potential causes further for effective resolution.