VW Polo manuals

Volkswagen Polo Service & Repair 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 Provi ...

Overview - Radial Ply Tire
...

Other materials:

Legal Requirements
The manufacturer is granted general type approval for the whole vehicle including all parts and for specific retrofitting (general type approval according to § 20 StVZO (Motor Vehicle Construction and Use Regulations or EU type approval). ...

Two-Part HS Optimum Clear Coat
Definition: Two-Part HS Optimum Clear Coat -LZK 769 K02 A5- Edition 10/2012 Product Description Two-part HS optimum clear coat is a VOC compliant (VOC value less than 420 g/L ...

Two-Part HS Performance Clear Coat
Definition: Two-Part HS Performance Clear Coat -LZK 769 K06 A5- Edition 08/2012 Product Description The two-part HS performance clear coat is a high-gloss, VOC compliant high ...

© 2016-2019 Copyright www.vwpolo.net