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DISCOVER THE NEW TYRE LABEL
EU TYRE LABELLING REGULATION 1222/2009 – GENERAL INFO
The Tyre Label is a mark for motor vehicle tyres. Manufacturers of tyres for cars, light and heavy trucks must specify fuel consumption, wet grip and noise classification of the product by means of a sticker or a label starting in November 2012.
This information must also be included in the technical promotional materials. The tyre label will use a classification from the best (green category "A") to the worst performance (red category "G” for Car and “F” for truck).
This initiative results from a proposal by the EU Commission in 2008 and it is part of the Energy Efficiency Action Plan, designed to improve the energy performance of products, buildings and services to reduce energy consumption by 20% until 2020.
(Source: European Commission)
FOR ADDITIONAL INFORMATION SEE ALSO:
FUEL EFFICIENCYROLLING RESISTANCE
with the tyre's rolling resistance.
Rolling Restistance is a force acting opposite to the travel direction when the tyre is rolling.
Considering that tyres contribute up to 20% of the overall fuel consumption for a car and up to 35% for a truck, it is important to reach low Rolling Resistance values.
Let’s understand how it works: due to the vehicle load, the tyre is deformed in the contact area with the road surface dissipating energy in form of heat. The higher deformations, the higher the rolling resistance and consequently more fuel consumption and CO2 emissions.
In the EU tyre Regulation label, rolling resistance is expressed in grades, ranging from A (best grading) to F for industrial vehicles and G for cars (worst grading).
The difference between each grade means a reduction or increase in fuel consumption of between 2.5% - 4.5% for a car and 5%-8% for a Truck. For a car that could be also roughly expressed in terms of 0.1l/100km.
associated to the tyre's wet grip.
Wet grip is one of the most important safety characteristic of a tyre. Excellent grip on wet means shorter braking distances when driving in rainy weather.
There are other important parameters which are relevant for safety but wet grip was chosen as the most representative situation in order to compare different tyres.
For a car the difference between each grade means an increase or decrease in stopping distance of roughly 3 and 6 meters when braking from 80km/h.
NOISE LEVELEXTERNAL (dB)
EXTERNAL NOISE LEVEL
(given in decibels)
Traffic noise is a relevant environmental issue determined by several factors such as:
Traffic intensity - Vehicle type - Driving style - Tyre-Road interaction
The value indicated in the label is not the internal that the driver will perceive while driving, but the external one, that is contributing to acoustic pollution.
It is expressed in decibel (dB) and split in 3 cathegories:
1 black sound wave
3dB less than the future tighter European limit.
2 black sound waves
Already compliant with the future European limit.
3 black sound waves
Compliant with the current European limit.
The more black bars shown on the label, the louder the tyre.
The rules apply only to passenger car tyres (C1), light truck tyres (C2) and heavy duty vehicle tyres (C3).
The following categories are excluded from the scope:
Professional Off Road tyres
Studded tyres (studdable tyres if supplied without studs are covered)
Temporary –use spare tyres
Tyres designed to be fitted on vehicles registered for the first time before 1 October 199
Tyres whose speed rating is less than 80 Km/h
Tyres whose nominal rim diameter does not exceed 254 mm or is 635 mm or more
RR is a force acting opposite to the travel direction if a tyre is rolling.
Due to the vehicle load, the tyre is deformed in the contact area with the road surface.
This deformation induces internal losses, same as a rubber ball falling down that does not rebound as high as it was launched.
Tyre RR can be expressed as a Force (Newton) or as a Coefficient (RRC).
The rolling resistance coefficient is defined as RR force (N) divided by the tyre load. The advantage of the coefficient is that it allows easier comparison of tyres designed to be fitted on different cars.
This consumes some fuel and so contributes to the vehicle fuel consumption.
As a rule of thumb, reducing RR by 6% decreases fuel consumption by 1% for passenger cars.
Many other factors contribute to vehicle fuel consumption:
Aerodynamics, vehicle weight, type of engine, auxiliary systems like air-condition, slope of the road, personal driving style, tyre pressure level, accelerations or general traffic conditions.
The tyre development engineer must use the right tools in the right amount to achieve the optimum balance for RR and wet grip.
If tyre RR limits are lowered too far, the required tradeoffs could adversely affect the wet grip performance.
it reflects the capacity of a tyre to brake on a wet road.
There are other parameters which are relevant for safety (e.g. road holding ability, directional control, deceleration ability on wet and dry surfaces at higher speed and aquaplaning behaviour) but wet grip was chosen as the most representative situation of reduced adherence in Europe.
A grading will give the performance level under defined testing conditions of the tyre on its rolling resistance, its braking on wet surface and its external rolling noise.
The procedures for verification are detailed under Annex IV of the regulation