EN    EN EN EN    EN  EUROPEAN COMMISSION 
Brussels, xxx 
C(2011) yyy final 
Draft 
COMMISSION REGULATION (EU) No …/2011 
of … 
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 EN 2   EN Draft 
COMMISSION REGULATION (EU) No …/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, 
Having regard to the Treaty on the Functioning of the European Union,  Having regard to Regulation (EC) No 1222/2009 of the European Parliament and of the 
Council of 25 November 2009 on the labelling of ty res with respect to fuel efficiency and 
other essential parameters
1, and in particular Article  11 (a) and (c) thereof, 
Whereas: (1) Regulation (EC) No 1222/2009 of the European Parliament and of the Council aims at 
establishing a framework for the provi sion of harmonised information on tyre 
parameters through labelling, allowing end-us ers to make an informed choice when 
purchasing tyres. 
(2) The rolling resistance of tyres determines their fuel efficiency grading. Reproducibility 
of the measurement of rolling resistance of ty res is necessary to ensure that the same 
tyres when tested in different laboratories ach ieve the same testing results, and thus to 
ensure a fair comparison between tyres fr om different suppliers . In addition, a good 
reproducibility of testing results prevents  market surveillance  authorities from 
obtaining different results from those of th e suppliers when testing the same tyres. 
(3) A procedure for the alignment of test laboratories with regard to the measurement of 
rolling resistance would improve the re producibility of the testing results. 
(4) Since a suitable harmonised testing method of  grip on wet roads has been developed at 
ISO level, a wet grip grading of C2 and C3 tyres should now be introduced, in 
accordance with Article 11 (a) of  Regulation (EC) No 1222/2009.  
(5) The clarity of the conformity verification procedure set out in A nnex IV of Regulation 
(EC) No 1222/2009 should be improved by intr oducing thresholds according to which 
the declared values used for the labellin g requirements are considered to be in 
compliance with that Regulation. 
(6) Regulation (EC) No 1222/2009 should  therefore be amended accordingly. 
                                                
 
1 OJ L 342, 22.12.2009, p. 46 .  EN 3   EN (7) The measures provided for in this Regulat ion are in accordance with the opinion of the 
Committee established by Article 13  of Regulation (EC) No 1222/2009, 
HAS ADOPTED THIS REGULATION: 
Article 1 
Amendment to Regulation (EC) No 1222/2009 
Regulation (EC) No 1222/2009 is amended as follows: 
(1) in Annex I, part A, the first se ntence is replaced by the following: 
"The fuel efficiency class must be determined on the basis of the rolling resistance coefficient 
(RRC ) according to the "A" to "G" scale specif ied below and measured in accordance with 
Annex 6 of  UNECE Regulation No 117 and its subsequent amendments and aligned 
according to the procedure laid down in Annex IVa. "; 
(2) in Annex I, part B, the text a nd table are replaced by the following:  
"1. The wet grip class of C1 tyres must be determined on the basis of the wet grip index 
(G) according to the "A" to "G" scale specif ied in the table below, calculated in 
accordance with point 3  and measured in accordance with Annex V. 
2. The wet grip class of C2 and C3 tyres must be determined on the basis of the wet 
grip index ( G) according to the "A" to "G" scal e specified in the table below, 
calculated in accordance with point (3) a nd measured in accordance with ISO 15222 
whereby the following  Standard Reference Test Tyres (SRTT) must be used : 
(i) for C2 tyres, the SRTT 225/75 R 16 C, ASTM F 2872; (ii) for C3 tyres having Nominal Section Width lower than 285 mm, the SRTT 
245/70R19.5, ASTM F 2871; 
(iii) for C3 tyres having Nominal Section Width greater than or  equal to 285 mm, 
the SRTT 315/70R22.5, ASTM F 2870. EN 4   EN 3. Calculation of wet grip index (G) 
G = G(T)  – 0,03  
where: G(T)  = wet grip index of the candidate ty re 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 is replaced by the following: 
"The conformity of the declared fuel effici ency and wet grip classes, as well as the 
declared external rolling noise class and m easured value, must be assessed for each 
tyre type or each grouping of tyres as determ ined 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  meets  the 
declared classes  or external rolling noise measured  declared  value within 
the range defined in Table 1 , the test is successfully  passed;  
 and 
(ii) if the measured values
 does  not meet the declared classes  or external 
rolling noise measured  declared  value within the range defined in Table 
1, three more tyres or tyre sets are tested. The average measurement 
value stemming from the four  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 ar e derived from type approval test results 
obtained in accordance with Direc tive 2001/43/EC, Regulation (EC) No 
661/2009, or UNECE Regulation No 117 and its subsequent amendments, EN 5   EN Member States may make use of measurement data obtained from conformity 
of production tests on tyres data from these type approvals . 
Assessment of the measurement data obtained from  the conformity of production tests data 
must take into account the allowances defined in Table 1as specified in section 8 of UNECE 
Regulation No 117 and its subsequent amendments . 
Table 1  
Measured parameter  Verification tolerances  
Fuel efficiency (rolling resistance coefficient)  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/t.  
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.  
" 
(4) the text set out in the annex to th is Regulation is added as Annex IVa. 
Article 2 
Entry into force 
This Regulation shall enter into force on the twentieth day following that of its publication in 
the Official Journal of  the European Union . 
This Regulation shall be binding in  its entirety and directly applicable in all Member States. 
This Regulation shall apply from [ date to be inserted: six months after the publication in the 
Official Journal of this amending Regulation ] 
Done at Brussels,  
 For the Commission 
 The President EN 6   EN ANNEX  
"ANNEX IVa 
Laboratory alignment procedure for th e measurement of rolling resistance 
1. D EFINITIONS  
For the purpose of the laboratory alignment procedure, the following definitions apply: 
(1) "Reference laboratory" means a laboratory th at is part of the ne twork 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 laborator y 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 representativ e of the network of reference laboratories 
that is used for the alignment procedure. 
2. G
ENERAL PROVISIONS  
2.1. Principle 
The measured Rolling Resistance Coefficient ( RRC m) in a reference laboratory ( l) shall be 
aligned to the assigned values of th e 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 tyre s. 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  EN 7   EN (b) The RRC m in the candidate or reference laboratories ( c or l) of each alignment tyre of 
the set shall be spaced out as fo llows 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 1143 mm for machines measuring C3 tyres. 
(e) Load index values shall adequately cover th e 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 check ed 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 correcti on for any machine drift. 
2.3. Measurement method 
The candidate or reference laboratory shall measure each alignment tyre three times, 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 No117 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 spec ified in paragraph 4 of Annex 6 of UNECE 
Regulation No117 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 ty re 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 temperatur e of 25°C and a drum diameter of 2 m),  
(b) the mean value of the three measured  values of each alignment tyre, and 
(c) the standard deviation ( σm) as follows: EN 8   EN  
∑
=⋅=p
iimmp1,2 1σ σ
 
 
∑∑
==⎟⎟
⎠⎞
⎜⎜
⎝⎛⋅−⋅−=n
jn
jji ji im CrnCrn 12
1, , ,1
11σ
 
where: 
i is the counter from 1 to p fo r the number of alignment tyres  
j is the counter from 1 to n for the number of repet itions of each measurement for a given alignment tyre 
n is the number of repe titions of tyre measurements (n = 3)  
p is the number of alignment tyres (p ≥ 5) 
3. R EQUIREMENTS APPLICABLE TO THE REFERENCE LABORATORIES AND 
DETERMINATION OF THE ASSIGNED VALUES  
The assigned values of each ali gnment tyre shall be determined  by a network of reference 
laboratories. After two years th e network shall assess the stabili ty and validity of the assigned 
values. 
Each reference laboratory participating in the network shall comply with the specifications of 
Annex 6 of UNECE Regulation No117 and its subs equent amendments and have a standard 
deviation ( σm) 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 th e specification of section 2.2 shall be measured 
in accordance with section 2.3 by each re ference 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. P
ROCEDURE 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 regr ession 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) EN 9   EN 5. REQUIREMENTS APPLICABLE TO CANDIDATE LABORATORIES  
Candidate laboratories shall repeat the alignmen t 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 th e candidate laboratory and by one reference 
laboratory. More than five al ignment tyres may be tested at  the request of the candidate 
laboratory. 
The alignment tyre set shall be provided by the candi date laboratory to the selected reference 
laboratory. 
The candidate laboratory ( c) shall comply with the specif ications of Annex 6 of UNECE 
Regulation No117 and its subsequent amendments and preferably have standard deviations 
(σm) 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 = (σm/γ)2 
where: 
γ = 0.043 kg/t for Class C1 and C2 tyres  
γ = 0.035 kg/t for Class C3 tyres 
6. P ROCEDURE FOR THE ALIGNMENT OF A CANDIDATE LABORATORY  
One reference laboratory ( l) of the network shall calculate th e linear regression function of the 
candidate laboratory ( c), A2 and B2, as follows: 
RRC m,l = A2 c x RRC m,c + B2 c  
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 x A2 c ) x RRC m,c + (A1 l x B2 c + B1 l)