The EU Labelling of tyres (fuel efficiency) Regulations (S.I. 342 of 2012) set out the national rules for the tyre labelling. Tyres are ranked on a scale from A (best) to G (worst).
With a view to ensuring that the fuel savings do not come at the expense of safety or noise, three parameters are evaluated:
- Fuel consumption is related to the rolling resistance. By reducing rolling resistance, the tyre consumes less petrol.
- Wet grip is one of the most important safety characteristics of a tyre. Tyres with very good wet grip have a shorter braking distance when it rains.
- The external noise generated by the tyre is expressed in waves: one black wave is the lowest noise level and three the highest. The aim is to reduce traffic-related noise.
A user-friendly guide to the Tyre Regulations is available here