VW Touran manuals

Volkswagen Touran Service Manual: 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:
   cR =
FR
Z
cR - Rolling resistance coefficient
FR - 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
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
To reduce fuel usage To improve road safety To reduce traffic noise The EU Tire Label Provides th ...

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