Out-of-balance tires will cause a car to vibrate at certain speeds, usually between 50 and 70 mph. Tires out of balance when 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 60mph. To balance a wheel, our technician will mount it on a balancing machine which spin the wheel to locate the heavier part. He will then compensate for the heavy part by attaching a lead weight on the opposite side which will help to minimize the vibration when you drive.