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30.11.2011 Official
Journal
of
the
European
Union L
317/17
COMMISSION REGULATION (EU) No 1235/2011
of 29 November 2011
amending Regulation (EC) No 1222/2009 of the European Parliament and of the Council with
regard to the wet grip grading of tyres, the measurement of rolling resistance and the
verification procedure
(Text with EEA relevance)
THE EUROPEAN COMMISSION,
(6) Regulation
(EC)
No
1222/2009
should
therefore
be
amended accordingly.
Having regard to the Treaty on the Functioning of the European
Union,
(7) The
measures
provided
for
in
this
Regulation
are
in
accordance with the opinion of the Committee estab
lished by Article 13 of Regulation (EC) No 1222/2009,
Having regard to Regulation (EC) No 1222/2009 of the
European Parliament and of the Council of 25 November
2009 on the labelling of tyres with respect to fuel efficiency
HAS ADOPTED THIS REGULATION:
and other essential parameters ( 1 ), and in particular Article 11(a)
and (c) thereof,
Article 1
Amendment to Regulation (EC) No 1222/2009
Whereas:
Regulation (EC) No 1222/2009 is amended as follows:
(1) Regulation
(EC)
No
1222/2009
of
the
European (1) Annex I, part A: Fuel efficiency classes, the first sentence is
Parliament and of the Council aims at establishing a
replaced by the following:
framework for the provision of harmonised information
on tyre parameters through labelling, allowing end-users
to make an informed choice when purchasing tyres.
‘The fuel efficiency class must be determined on the basis of
the rolling resistance coefficient (RRC) according to the “A”
to “G” scale specified below and measured in accordance
(2) The
rolling
resistance
of
tyres
determines
their
fuel
effi
with Annex 6 of UNECE Regulation No 117 and its
ciency grading. Measurement of rolling resistance must
subsequent amendments and aligned according to the
be reproducible; tests on the same tyres in different
procedure laid down in Annex IVa.’;
laboratories must produce the same results in order to
ensure a fair comparison between tyres from different
suppliers. In addition, a good reproducibility of testing
(2) in Annex I, part B: Wet grip classes, the text and table are
results prevents market surveillance authorities from
replaced by the following:
obtaining different results from those of the suppliers
when testing the same tyres.
‘1. The wet grip class of C1 tyres must be determined on
the basis of the wet grip index (G) according to the “A”
(3) A
procedure
for
the
alignment
of
test
laboratories
with
to “G” scale specified in the table below, calculated in
regard to the measurement of rolling resistance would
accordance with point 3 and measured in accordance
improve the reproducibility of the testing results.
with Annex V.
2. The wet grip class of C2 and C3 tyres must be
(4) Since
a
suitable
harmonised
testing
method
of
grip
on
determined on the basis of the wet grip index (G)
wet roads has been developed at ISO level, a wet grip
according to the “A” to “G” scale specified in the table
grading of C2 and C3 tyres should now be introduced, in
below, calculated in accordance with point (3) and
accordance with Article 11 (a) of Regulation (EC) No
measured in accordance with ISO 15222:2011
1222/2009.
whereby the following Standard Reference Test Tyres
(SRTT) must be used:
(5) The
clarity
of
the
conformity
verification
procedure
set
out in Annex IV of Regulation (EC) No 1222/2009
(i) for C2 tyres, the SRTT 225/75 R 16 C, ASTM F
should be improved by introducing thresholds
2872-11;
according to which the declared values used for the
labelling requirements are considered to be in compliance
with that Regulation.
(ii) for C3 tyres having Nominal Section Width lower
than 285 mm, the SRTT 245/70R19.5, ASTM F
( 1 ) OJ L 342, 22.12.2009, p. 46.
2871-11;

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L 317/18
EN
Official Journal of the European Union
30.11.2011
(iii) for C3 tyres having Nominal Section Width greater than or equal to 285 mm, the SRTT
315/70R22.5, ASTM F 2870-11.
3. Calculation of wet grip index (G)
G = G(T) – 0,03
where: G(T) = wet grip index of the candidate tyre as measured in one test cycle
C1 tyres C2
tyres C3
tyres
G Wet
grip
class
G Wet
grip
class
G Wet
grip
class
1,55 ≤ G
A 1,40
≤ G
A 1,25
≤ G
A
1,40 ≤ G ≤ 1,54
B 1,25
≤ G ≤ 1,39
B 1,10
≤ G ≤ 1,24
B
1,25 ≤ G ≤ 1,39
C 1,10
≤ G ≤ 1,24
C 0,95
≤ G ≤ 1,09
C
Empty
D Empty
D 0,80
≤ G ≤ 0,94
D
1,10 ≤ G ≤ 1,24
E 0,95
≤ G ≤ 1,09
E 0,65
≤ G ≤ 0,79
E
G ≤ 1,09
F
G ≤ 0,94
F
G ≤ 0,64
F
Empty
G Empty
G Empty G’
(3) Annex IV: Verification procedure, is replaced by the following:
‘ANNEX IV
Verification procedure
The conformity of the declared fuel efficiency and wet grip classes, as well as the declared external rolling noise class
and declared value, must be assessed for each tyre type or each grouping of tyres as determined by the supplier,
according to one of the following procedures:
(a) (i) a single tyre or tyre set is tested first. If the measured values meet the declared classes or external rolling noise
declared value to within the tolerance defined in Table 1, the test is successfully passed; and
(ii) if the measured values do not meet the declared classes or external rolling noise declared value within the
range defined in Table 1, three more tyres or tyre sets are tested. The average measurement value stemming
from the three tyres or tyre sets tested is used to assess conformity with the declared information within the
range defined in Table 1; or
(b) where the labelled classes or values are derived from type approval test results obtained in accordance with
Directive 2001/43/EC, Regulation (EC) No 661/2009, or UNECE Regulation No 117 and its subsequent
amendments, Member States may make use of measurement data obtained from conformity of production
tests on tyres.
Assessment of the measurement data obtained from the conformity of production tests must take into account the
allowances defined in Table 1.
Table 1
Measured parameter Verification
tolerances
Rolling resistance coefficient (fuel efficiency) The
aligned
measured
value
shall
not
be
greater
than
the
upper limit (the highest RRC) of the declared class by
more than 0,3 kg/1 000kg.
External rolling noise The
measured
value
shall
not
be
greater
than
the
declared value of N by more than 1 dB(A).
Wet grip The
measured
value
shall
not
be
lower
than
the
lower
limit (the lowest value of G) of the declared class.’

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EN
30.11.2011 Official
Journal
of
the
European
Union L
317/19
(4) the text set out in the Annex to this Regulation is added as Annex IVa.
Article 2
Entry into force
This Regulation shall enter into force on the 20th day following its publication in the Official Journal of the
European Union.
This Regulation shall apply from 30 May 2012.
This Regulation shall be binding in its entirety and directly applicable in all Member States.
Done at Brussels, 29 November 2011.
For the Commission
The President
José Manuel BARROSO

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L 317/20
EN
Official Journal of the European Union
30.11.2011
ANNEX
‘ANNEX IVa
Laboratory alignment procedure for the measurement of rolling resistance
1. DEFINITIONS
For the purpose of the laboratory alignment procedure, the following definitions apply:
(1) “Reference laboratory” means a laboratory that is part of the network of laboratories the references of which
have been published for the purpose of the alignment procedure in the Official Journal of the European Union, and
is able to achieve the accuracy of test results determined in section 3;
(2) “Candidate laboratory” means a laboratory participating in the alignment procedure that is not a reference
laboratory;
(3) “Alignment tyre” means a tyre that is tested for the purpose of performing the alignment procedure;
(4) “Alignment tyres set” means a set of five or more alignment tyres;
(5) “Assigned value” means a theoretical value of one alignment tyre as measured by a theoretical laboratory which
is representative of the network of reference laboratories that is used for the alignment procedure.
2. GENERAL
PROVISIONS
2.1. Principle
The measured Rolling Resistance Coefficient (RRC m ) in a reference laboratory (l) shall be aligned to the assigned
values of the network of reference laboratories.
The RRC m in a candidate laboratory (c) shall be aligned through one reference laboratory of the network of its
choice.
2.2. Tyre selection requirements
A set of five or more alignment tyres shall be selected for the alignment procedure in compliance with the criteria
below. One set shall be selected for C1 and C2 tyres together, and one set for C3 tyres.
(a) The set of alignment tyres shall be selected so as to cover the range of different RRCs of C1 and C2 tyres
together, or of C3 tyres. In any event, the difference between the highest RRC m of the tyre set, and the lowest
RRC m of the tyre set shall be at least equal to:
(i) 3 kg/t for C1 and C2 tyres; and
(ii) 2 kg/t for C3 tyres.
(b) The RRC m in the candidate or reference laboratories (c or l) based on declared RRC values of each alignment tyre
of the set shall be spaced out as follows and distributed uniformly:
(i) 1,0 +/– 0,5 kg/t for C1 and C2 tyres; and
(ii) 1,0 +/– 0,5 kg/t for C3 tyres.
(c) The selected tyre section width of each alignment tyre shall be:
(i) ≤ 245 mm for machines measuring C1 and C2 tyres; and
(ii) ≤ 385 mm for machines measuring C3 tyres.
(d) The selected tyre outer diameter of each alignment tyre shall be:
(i) between 510 to 800 mm for machines measuring C1 and C2 tyres; and
(ii) between 771 to 1 143 mm for machines measuring C3 tyres.

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EN
30.11.2011 Official
Journal
of
the
European
Union L
317/21
(e) Load index values shall adequately cover the range of the tyres to be tested, ensuring that the rolling resistance
force (RRF) values also cover the range of the tyres to be tested.
Each alignment tyre shall be checked prior to use and replaced when:
(a) it shows a condition which makes it unusable for further tests; and/or
(b) there are deviations of RRC m greater than 1,5 per cent relative to earlier measurements after correction for
any machine drift.
2.3. Measurement method
The reference laboratory shall measure each alignment tyre four times and retain the three last results for further
analysis, in accordance with paragraph 4 of Annex 6 of UNECE Regulation No 117 and its subsequent amendments
and applying the conditions set out in paragraph 3 of Annex 6 of UNECE Regulation No 117 and its subsequent
amendments.
The candidate laboratory shall measure each alignment tyre (n + 1) times with n being specified in section 5 and
retain the n last results for further analysis, in accordance with paragraph 4 of Annex 6 of UNECE Regulation No
117 and its subsequent amendments and applying the conditions set out in paragraph 3 of Annex 6 of UNECE
Regulation No 117 and its subsequent amendments.
Each time an alignment tyre is measured, the tyre/wheel assembly shall be removed from the machine and the entire
test procedure specified in paragraph 4 of Annex 6 of UNECE Regulation No 117 and its subsequent amendments
shall be followed again from the start.
The candidate or reference laboratory shall calculate:
(a) the measured value of each alignment tyre for each measurement as specified in Annex 6, paragraphs 6.2 and
6.3, of UNECE Regulation No 117 and its subsequent amendments (i.e. corrected for a temperature of 25 °C and
a drum diameter of 2 m);
(b) the mean value of the three (in the case of reference laboratories) or n (in the case of candidate laboratories) last
measured values of each alignment tyre; and
(c) the standard deviation (σ m ) as follows:

p
v σ
u p 2 m;
1
σ m u t X i
i 1
n
2
1
n
v
u
8

Cr

n – 2

n –
1
i;j
1
σ m;i t X >
j 2 : Cr i;j – X j 2 9 > ;
where:
i is the counter from 1 to p for the number of alignment tyres
j is the counter from 2 to n for the number of repetitions of each measurement for a given alignment tyre
n is the number of repetitions of tyre measurements (n ≥4)
p is
the
number
of
alignment
tyres
(p
≥ 5)
2.4. Data formats to be used for the computations and results
— The measured RRC values corrected from drum diameter and temperature shall be rounded to 2 decimal places.
— Then the computations shall be made with all digits: there shall be no further rounding except on the final
alignment equations.
— All standard deviation values shall be displayed to 3 decimal places.
— All RRC values will be displayed to 2 decimal places.
— All alignment coefficients (A1 l , B1 l , A2 c and B2 c ) shall be rounded and displayed to 4 decimal places.

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L 317/22
EN
Official Journal of the European Union
30.11.2011
3. REQUIREMENTS APPLICABLE TO THE REFERENCE LABORATORIES AND DETERMINATION OF THE ASSIGNED
VALUES
The assigned values of each alignment tyre shall be determined by a network of reference laboratories. After two
years the network shall assess the stability and validity of the assigned values.
Each reference laboratory participating in the network shall comply with the specifications of Annex 6 of UNECE
Regulation No 117 and its subsequent amendments and have a standard deviation (σ m ) as follows:
(i) not greater than 0,05 kg/t for class C1 and C2 tyres; and
(ii) not greater than 0,05 kg/t for class C3 tyres.
The sets of alignment tyres, conforming to the specification of section 2.2 shall be measured in accordance with
section 2.3 by each reference laboratory of the network.
The assigned value of each alignment tyre is the average of the measured values given by the reference laboratories
of the network for this alignment tyre.
4. PROCEDURE
FOR
THE
ALIGNMENT
OF
A
REFERENCE
LABORATORY
TO
THE
ASSIGNED
VALUES
Each reference laboratory (l) shall align itself to the assigned values of the alignment tyre set using a linear regression
technique, A1 l and B1 l , calculated as follows:
RRC = A1 l * RRC m,l + B1 l
where:
RRC
is the assigned value of the rolling resistance coefficient;
RRC m, is the measured value of the rolling resistance coefficient by the reference laboratory ‘l’ (including
temperature and drum diameter corrections)
5. REQUIREMENTS
APPLICABLE
TO
CANDIDATE
LABORATORIES
Candidate laboratories shall repeat the alignment procedure at least once every two years and always after any
significant machine change or any drift in machine control tyre monitoring data.
A common set of five different tyres, conforming to the specification of section 2.2 shall be measured in accordance
with section 2.3 by the candidate laboratory and by one reference laboratory. More than five alignment tyres may be
tested at the request of the candidate laboratory.
The alignment tyre set shall be provided by the candidate laboratory to the selected reference laboratory.
The candidate laboratory (c) shall comply with the specifications of Annex 6 of UNECE Regulation No 117 and its
subsequent amendments and preferably have standard deviations (σ m ) as follows:
(i) not greater than 0,075 kg/t for C1 and C2 tyres; and
(ii) not greater than 0,06 kg/t for C3 tyres.
If the standard deviations (σ m ) of the candidate laboratory are higher than the above values with three measurements,
then the number of measurement repetitions shall be increased as follows:
n = (σ m /γ) 2 , rounded up to the nearest higher integer value
where:
γ = 0,043 kg/t for Class C1 and C2 tyres
γ = 0,035 kg/t for Class C3 tyres
6. PROCEDURE
FOR
THE
ALIGNMENT
OF
A
CANDIDATE
LABORATORY
One reference laboratory (l) of the network shall calculate the linear regression function of the candidate laboratory
(c), A2 c and B2 c , as follows:
RRC m,l = A2 c × RRC m,c + B2 c

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EN
30.11.2011 Official
Journal
of
the
European
Union L
317/23
where:
RRC m,l is the measured value of the rolling resistance coefficient by the reference laboratory (l) (including
temperature and drum diameter corrections)
RRC m,c is the measured value of the rolling resistance coefficient by the candidate laboratory (c) (including
temperature and drum diameter corrections)
The aligned RRC of tyres tested by the candidate laboratory is calculated as follows:
RRC = (A1 l × A2 c ) × RRC m,c + (A1 l × B2 c + B1 l )’

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