Out-of-balance tyres will cause a car to vibrate at certain speeds, usually between 80 and 110 kmh. A tyre is out of balance when one section of the tyre is heavier than the others. Ten grams of imbalance on a front tyre is enough to cause a noticeable vibration in the steering wheel at about 100 kmh. To balance a 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 tyres will hold their balance fairly well and go out of balance very gradually. 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.
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