Your tires might be out of balance... If it is out balance it can cause a car to vibrate at certain speeds, usually between 50 and 70 mph. If you notice a vibration that wasn't there the day before, it is possible that one of the lead balancing weights fell off. If you feel the vibration mostly in the steering wheel, the problem is most likely in a front wheel. If the vibration is mostly in the seat, the problem is probably in the rear. It is said to be out of balance if one section of the tire is heavier than the others. One ounce of imbalance on a front tire is enough to cause a noticeable vibration in the steering wheel at about 60 mph. In balancing the wheel, the technician will mount it on a balancing machine which spins the wheel to locate the heavier part. He will then compensate for the heavy part by attaching a lead weight on the opposite side. Many people are pleasantly surprised at how smooth their car drives after balancing all four wheels. Most high quality tires even if it is a Ford probe performance parts
will hold their balance fairly well and go out of balance very gradually. Good luck!!!