Volkswagen Golf Service & Repair Manual: EU tyre label, categories
| Rolling resistance
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| Defined as, energy consumed by the tyre in respect of the
distance travelled. |
| Equates to the energy lost per defined unit of distance
travelled. |
| The energy form can be described as the quotient of Newton
meter (Nm) and distance travelled in meter (m). This then
provides a rolling resistance as a form of force in Newtons (N). |
| The rolling resistance of a tyre is then described by the
coefficient of rolling resistance (also known as rolling
resistance coefficient) cR: |
| cR - coefficient of rolling
resistance |
| FR - force of rolling resistance |
| Z - weight of vehicle (sum of all wheel loads) |
| Reduction of rolling resistance |
| Reduction of fuel and CO2 |
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| Structured in fuel efficiency categories from A to G |
 Note
| The fuel efficiency category is listed in EU regulation (EC)
No. 1222/2009, the tyre is then allocated to the respective
category. |
| The rolling resistance is established by the tyre
manufacture via prescribed tests. |
| The lower the rolling resistance, the lower the fuel
consumption. |
| A - |
Lowest rolling resistance = lowest fuel consumption |
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| The wet grip index G must be established for the wet grip.
The wet grip index G is established using a deceleration test
(distance required to decelerate from 80 km/h to 20 km/h) using
a standardised vehicle on a wet slippery surface. The test uses
a predefined standard reference test tyre (SRTT), with which the
wet grip index G can be calculated. The calculation uses the
mean fully developed deceleration (mfdd) produced. |
| The mean fully developed deceleration (mfdd) is calculated
as follows: |
| S - the measured braking distance in metres between 80 km/h
and 20 km/h |
| The wet grip index G is calculated as follows: |
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G =
| mfdd of tyre
to be checked |
| mfdd of standard reference test tyre |
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| mffd - mean fully developed deceleration |
| Greatly reduced bake distance |
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| Structured in wet grip categories from A to G |
| Categories D and G are not used |
Note
| The wet grip category is listed in EU regulation (EC) No.
1222/2009, the tyre is then allocated to the respective
category. |
| The lower the wet grip index, the shorter the braking
distance. |
| A - |
Lowest wet grip index = shortest braking distance |
| B - |
3 to 6 m longer braking distance in comparison with category
A |
| C - |
3 to 6 m longer braking distance in comparison with category
B |
| E - |
3 to 6 m longer braking distance in comparison with category
C |
| F - |
3 to 6 m longer braking distance in comparison with category
E |
| 1 - |
The braking distance between categories A and F can be more
than 18 m when undertaking an emergency stop at 80 km/h. |
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| Reduction of pass-by noise |
| Measured on outside of vehicle only |
| Divided into three categories |
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| Three black arcs indicate the worst performance. The tyres
produce a rolling noise that lies below the current limit
according to EU regulation 2001/43/EG. The limit lies above the
limit that has been set for from 2016 according to regulation
(EG) No. 661/2009. |
| Two black arcs: The tyre noise limit lies below the limit
that has been set for from 2016 according to regulation (EG) No.
661/2009. |
| One black arc: The tyre noise limit lies below the limit
that has been set for from 2016 according to regulation (EG) No.
661/2009, by at least three decibels. |
Note
| Reducing the noise level from two arcs to one arc equates to
3 dB, which halves the noise level. |
| Note, the external rolling noise of the tyre does not always
correspond with the noise in the vehicle interior. |
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Reducing fuel consumption
Increasing road safety
Reducing traffic noise
The EU tyre label provide ...
Other materials:
Removing and installing bulbs for cornering light -L148-/-L149-
Note
Left cornering light bulb -L148- and right cornering light
bulb -L149- are only fitted on gas discharge headlights.
Removal and installation are described for the left side.
Removal and installation on the right ...
Overview of the front passenger side
Fig. 10 Overview of the front passenger
side (left-hand drive vehicles). The controls are mirrored for right-hand drive
vehicles
Fig. 11 Dash panel near open front passenger
door (left-hand drive vehicles). The controls are mirrored for right-hand drive
vehicles
Key for and :
...
Specified values for wheel alignment, torsion beam axle, Golf
These specifications apply to all engines.
Explanations regarding PR numbers
→ Chapter „Vehicle data sticker“.
Front axle
Basic
running gear
Sports
running gear
Raised
running gear
DCC
running gear
...
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EU tyre label, objectives