The common symptoms of out-of-balance tires are uneven and faster tread wear, poor fuel economy, and vibration in the steering wheel, the floorboard or the seat that gets worse at faster speeds. When all areas of the wheel-tire unit are as equal in weight as possible, the tire will roll smoothly.                                               

Tire balancing is a tune-up for your wheel-tire set. It makes sure that weight is evenly distributed around the entire circumference of the unit. ... Imbalanced tires are easily corrected, but the work is precise. It's done by attaching small weights, just fractions of ounces, to the wheel.                                                    

Tire balancing provides a smooth ride and assures even tire wear by properly adjusting the tire weight distribution around the vehicle