Use the label to compare tyre performance
With tyre labelling, consumers will be able to compare tyres using criteria other than the brand or price. However, consumers still need to know what the difference is between two classes in terms of braking distance and fuel consumption.
On the same topic
One of the aims of tyre labelling is to improve consumer information so that they can compare tyres based on criteria other than the price. This legislation, implemented at a European level, should effectively allow drivers to buy safer and more environmentally friendly tyres.
The label indicates the tyre’s performance class based on three criteria: Fuel efficiency, wet grip and external rolling noise. Here are some pointers to help you understand what the difference is between two ratings for each performance measured.
The tyre’s contribution to fuel consumption is calculated based on its rolling resistance. The label indicates, with a colour and a letter, the tyre’s rolling resistance class. Between an A and a G class tyre, the performance difference is very significant.
For fuel consumption, this difference represents the equivalent of 4.7 mpg, i.e. 80 litres fuel per year (on the basis of 10,000 miles per year).
For CO2 emissions, the difference between an A and a G class tyre represents the equivalent of 12g/km i.e. 18 tonnes of CO2 per year (on the same basis). By comparison, the threshold to trigger the eco tax is set at 135 g/km in the draft legislation for 2013.
For wet braking performance, the class is obtained by comparing test results with those obtained for a reference tyre.
The difference between A and F class tyres (G class is not used) represents a distance of 18 metres for a car travelling at 80 mph i.e. the equivalent of 4 car lengths.
External rolling noise
The class is obtained by comparing the test result with a maximum limit, which varies depending on the type of tyre and its size. This maximum value will be reduced by 2016.
The performance difference between two classes corresponds to 3 dB, i.e. the noise level is increased or decreased by half.
1 sound wave: Good performance. The level of external rolling noise is 3 dB below the future limit.
2 sound waves: Average performance. The level of tyre external rolling noise is in line with the future limit.
3 sound waves: Poor performance. The level of external rolling noise is acceptable based on the current standard but higher than maximum value coming into force by 2016.