When a tyre is rolling it deforms and energy is dispersed. The energy that is lost is called rolling resistance and this has an effect on fuel consumption and also the environment. The lower the rolling resistance the less energy and less fuel the tyre uses.
The difference between an A rating and a G rating could mean a reduction in fuel consumption of up to 7.5%. To put this in real terms, choosing A-rated tyres instead of G-rated tyres could save you more than 6 liters of fuel every 1000 kilometers.
*Rating D is not used for passenger cars.
The better your wet grip the shorter your braking distance on wet and slippery roads, keeping you safe in the rain.
The rating you will see on the EU tyre label is measured from the braking distance at 50mph in wet conditions. The difference between class G and A for a full set of tyres can be a 30% shorter braking distance. For example fora car driving 80km/h, this may represent a shorter braking distance of 18m.
*Ratings D and G are not used for passenger cars.
The exterior noise of a tyre is expressed in decibels (dB) and this is shown by 1, 2 or 3 waves on the EU tyre label.
Decibel levels are measured on a logarithmic scale. This means that an increase of just a few decibels represents a big difference in noise levels. In fact, a difference of 3dB doubles the amount of external noise the tyre produces.
1)black wave: low noise tyre (3dB or more below the future European limit)
2)black waves: average tyre (between the future European limit and 3dB below)
3)black waves: noisier tyre (above the future European limit)*The new European tyre external noise levels will be introduced by 2016.