Wheel balancing ensures that the weight of the wheel and tyre is even around the axle, and is achieved by placing tiny offsetting weights at specific points around the wheel.
If you notice uneven tyre wear or tyre 'wobble' at 40 - 50mph, it is likely that your wheels need re-balancing.
If your tyres are Unbalanced, you will notice vibration. This can lead the driver to fatigue, premature or irregular tyre wear and unnecessary wear and tear to your vehicle's suspension. Your tyres should be balanced when they are mounted on wheels for the first time or when they are remounted after repairs. Check your tyre balance at the first sign of vibration.