Volkswagen Polo Service & Repair Manual: EU Tire Label, Categories
Rolling Resistance. Refer to
→ Anchor 
Wet Grip. Refer to
→ Anchor 
Noise Emission. Refer to
→ Anchor 



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}  Rolling resistance
coefficient 
F_{R}  Rolling resistance force 
Z  Vehicle weight (sum of all wheel loads) 
To reduce rolling resistance 
To economize fuel and CO_{2} 



Separated into fuel efficiency classes A to G 
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 



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: 
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 
Sharp decrease in braking distance 



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. 



Take measurements from outside of the vehicle only 
Divided into three classes 



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. 



To reduce fuel usage
To improve road safety
To reduce traffic noise
The EU Tire Label Provi ...
Other materials:
Overview of the menu structure
First read and observe the introductory
information and safety warnings
MFD (multifunction display)
Driving time
Current fuel consumption (Curr. fuel con.)
Average fuel consumption (Av. consumption)
Fuel range
Distance
Average speed
Digital speed display
Digital oil ...
Odor from Evaporator or Heat Exchanger?
Fishy smell
–
From leak at cooling system of engine or of A/C system
heater core.
Note
If the fishy smell gets weaker when the temperature is set
to “cold” and stronger when i ...
Refrigerant Circuit with Restrictor and Reservoir
1 
A/C Compressor
2 
Condenser
3 
Restrictor
4 
Evaporator
5 
Reservoir with dryer bag
...
© 20162019 Copyright www.vwpolo.net