Volkswagen Polo Service & Repair Manual: EU Tire Label, Categories

Volkswagen Polo Service & Repair Manual / Whels, Tires, Whel Alignment / Tire Information / EU Tire Label / EU Tire Label, Categories

Rolling Resistance. Refer to → Anchor

Wet Grip. Refer to → Anchor

Noise Emission. Refer to → Anchor

Rolling Resistance

Rolling resistance:

Is defined as the amount of energy used by a tire to travel to a given distance.

This corresponds to the loss of energy in units per defined distance.

This is expressed as an quotient of energy in Newton meters (Nm) and of distance in meters (m). Thus, the rolling resistance is expressed as a force in Newtons (N).

The rolling resistance of a tire is defined by the rolling resistance coefficient c _R:

c_R =

F_R

c_R - Rolling resistance coefficient

F_R - Rolling resistance force

Z - Vehicle weight (sum of all wheel loads)

Goal

To reduce rolling resistance

To economize fuel and CO₂

EU Tire Label, Categories

Evaluation

Separated into fuel efficiency classes A to G

Class D is not used

Note

The fuel efficiency classes are listed in EU Regulation (EG) 1222/2009. Tires categories are established by this regulation.

The rolling resistance is ascertained by prescribed tests performed by the tire manufacturer.

The lower the rolling resistance, the lower the fuel consumption.

A -	Lowest rolling resistance coefficient = lowest fuel consumption

B -	+ 0.10 liters / 100 km

C -	+ 0.12 liters / 100 km

E -	+ 0.14 liters / 100 km

F -	+ 0.15 liters / 100 km

G -	+ 0.15 liters / 100 km

EU Tire Label, Categories

Wet Grip

Definition

For the wet grip, the wet grip parameter G must be determined. The wet grip parameter G is defined by testing the distance required by a standardized vehicle to brake from 80 km/h (49.7 mph) down to 20 km/h (12.42 mph) on a wet, even road surface. The test is performed using predefined standard reference test tires (SRTT), allowing for the wet grip parameter G to be determined. Mean fully developed deceleration (mfdd) is used for the test.

The mean fully developed deceleration is determined thusly:

mfdd =

231.48

S - the braking distance between 80 km/h (49.7 mph) and 20 km/h (12.42 mph) in meters

The wet grip parameter G is determined thusly:

G =

mfdd of the tire to be checked

mfdd of the standard reference tire

mfdd - mean fully developed deceleration

Goal

Good wet grip on tire

Sharp decrease in braking distance

EU Tire Label, Categories

Evaluation

Separated into wet grip classes A to G

Classes D and G are not used

Note

The wet grip classes are listed in EU Regulation (EG) 1222/2009. Tires categories are established by this regulation.

The lower the wet grip parameter, the shorter the braking distance.

A -	lowest wet grip parameter = shortest braking distance

B -	3 to 6 m longer braking distance compared to category A

C -	3 to 6 m longer braking distance compared to category B

E -	3 to 6 m longer braking distance compared to category C

F -	3 to 6 m longer braking distance compared to category E

1 -	When emergency braking at 80 km/h (49.7 mph), the difference between using class A and class F tires can be more than 18 m.

EU Tire Label, Categories

Noise Emission

Goal

To reduce pass-by noise

To reduce noise impact

Evaluation

Take measurements from outside of the vehicle only

Divided into three classes

EU Tire Label, Categories

Three black waves signify the worst performance. The tire produces external rolling noise, which falls below the current EU Directive 2001/43/EG limit. The limit surpasses the future limit set by EU Regulation (EG) 661/2009, which will go into effect in 2016.

Two black waves: the tire noise level does not exceed the future limit set by EU Regulation (EG) 661/2009, which will go into effect in 2016.

One black wave: the tire noise level does not exceed the future limit set by EU Regulation (EG) 661/2009, which will go into effect in 2016, by at least three decibels.

Note

Reducing the noise measured value from two black waves down to one corresponds to 3 dB, which halves the noise level.

Please note that extreme tire rolling noise does not always correspond to the noise in the vehicle interior.

EU Tire Label, Categories

EU Tire Label, Goals

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