EU Tyre Labelling Regulation
Regulations require tyre manufacturers to declare fuel efficiency, wet grip rating and external rolling noise performance for C1, C2 and C3 tyres (i.e. tyres mainly fitted on passenger cars, and on light and heavy duty vehicles).
Lack of reliable and comparable information on the performance of tyres currently makes it difficult for consumers to take these elements into account in their purchasing decision, especially when replacing a used set of tyres. From 1st November 2012 tyre performances data will be displayed at the point of sale and on all technical promotional literature such as catalogues, leaflets and web-based marketing.
The aim is to lead a market transformation towards a more fuel-efficient, safe and low-noise tyre, beyond the standards already achieved. It will also pave the way for competition to run on tyre performance and price, which will in turn stimulate investment in research and development.
(Source: European Commission)
The EU tyre labelling system is implemented by the following three criteria:
01. Fuel Efficiency
Fuel efficiency is measured by the rolling resistance (RR) of tyres.
Rolling resistance is the resistance that occurs when a round object such as a ball or tyre rolls on a flat surface in a steady velocity straight-line motion. It is caused mainly by the deformation of the object, the deformation of the surface, or both.
Additional contributing factors include wheel radius, forward speed, surface adhesion, and relative micro-sliding between the surfaces of contact. It depends very much on the material of the wheel or tyre and the sort of ground.
|Class||PCR (C1)||LTR (C2)||TBR (C3)|
|A||RRC ≤ 6.5||RRC ≤ 5.5||RRC ≤ 4.0|
|B||6.6 ≤ RRC ≤ 7.7||5.6 ≤ RRC ≤ 6.7||4.1 ≤ RRC ≤ 5.0|
|C||7.8 ≤ RRC ≤ 9.0||6.8 ≤ RRC ≤ 8.0||5.1 ≤ RRC ≤ 6.0|
|D||Empty||Empty||6.1 ≤ RRC ≤ 7.0|
|E||9.1 ≤ RRC ≤ 10.5||8.1 ≤ RRC ≤ 9.2||7.1 ≤ RRC ≤ 8.0|
|F||10.6 ≤ RRC ≤ 12.0||9.3 ≤ RRC ≤ 10.5||8.1 ≤ RRC|
|G||12.1 ≤ RRC||10.6 ≤ RRC||Empty|
Seven classes from G (least efficient) to A (most efficient)
Effects may vary among vehicles and driving conditions, but the difference between a G and an A class for a complete set of tyres could reduce fuel consumption by up to 7.5% and even more in the case of trucks.
02. Wet Grip
Wet grip indicates the braking performance of tyres on wet road surfaces and is related to the safety performance of vehicles. Tyres with low rolling resistance have high fuel efficiency, but can have safety problems. This is because tyres with low rolling resistance have low adherence to roads when the roads are wet. Accordingly, the European Council requires tyre companies to provide information about their tyres adherence (or grip) when applying the brakes on wet roads.
|Class||PCR (C1)||LTR (C2)||TBR (C3)|
|A||1.55 ≤ G||1.40 ≤ G||1.25 ≤ G|
|B||1.40 ≤ G ≤ 1.54||1.25 ≤ G ≤ 1.39||1.10 ≤ G ≤ 1.24|
|C||1.25 ≤ G ≤ 1.39||1.10 ≤ G ≤ 1.24||0.95 ≤ G ≤ 1.09|
|D||Empty||Empty||0.80 ≤ G ≤ 0.94|
|E||1.10 ≤ G ≤ 1.24||0.95 ≤ G ≤ 1.09||0.65 ≤ G ≤ 0.79|
|F||G ≤ 1.09||G ≤ 0.94||G ≤ 0.64|
Seven classes from G (longest braking distances) to A (shortest braking distances)
Effects may vary among vehicles and driving conditions, but in the case of full braking, the difference between a G and an A class for a set of four identical tyres could be up to 30% shorter braking distance (e.g. for a typical passenger car driving at 80 km/h speed this could be up to 18m shorter braking distance).
03. Noise Level
Exterior noise levels are measured in decibel (dB) and are indicated in three categories (refer to the black bars on the left). The more black bars present, the more road noise is created from the tyres.
In addition to the specification of noise level in Decibels (dB(A)) a pictogram displays whether the tyre external rolling noise performance is above the future European mandatory limit value (three black bars = noisier tyre), up to 3 dB below the future limit value (two black bars = average noise level) or more than 3 dB below the future limit value (one black bar = low noise tyre)..