Tyre balance, also referred to as tyre unbalance or imbalance, describes the distribution of mass within an automobile tyre or the entire wheel to which it is attached.

When the wheel rotates, asymmetries of mass may cause it to hop or wobble, which can cause ride disturbances, usually vertical and lateral vibrations. It can also result in a wobbling of the steering wheel or of the entire vehicle. The ride disturbance, due to unbalance, usually increases with speed. Vehicle suspensions can become excited by unbalance forces when the speed of the wheel reaches a point that its rotating frequency equals the suspensionís resonant frequency.

Tyres are inspected in factories and repair shops by  balancers . Tyres with high unbalance forces are downgraded or rejected. When tyres are fitted to wheels at the point of sale, they are measured again on a balancing machinee, and correction weights are applied to counteract the combined effect of the tyre and wheel unbalance. After sale, tires may be rebalanced if driver perceives excessive vibration.
 
Tyre rotation is vital to achieving even tread wear and long tread life. Rotation is necessary because of the uneven wear characteristics of each wheel position on the vehicle. A good example is Front Wheel Drive vehicles which places braking, steering and driving forces on the front axle tyres. Rear axle tyres only receive braking forces resulting in a much faster wear rate for the front axle tyres. Tyre rotation for these vehicles therefore becomes very important for optimum tyre life.
 

 
 
   
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