(1) Annex I, part A: Fuel efficiency classes, the first sentence 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 specified 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: Wet grip classes, the text and 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 specified 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" scale specified in the table below, calculated in accordance with point (3) and measured in accordance with ISO 15222:2011 whereby the following Standard Reference Test Tyres (SRTT) must be used:(i) for C2 tyres, the SRTT 225/75 R 16 C, ASTM F 2872-11; (ii) for C3 tyres having Nominal Section Width lower than 285 mm, the SRTT 245/70R19.5, ASTM F 2871-11; (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) – 0,03where: G(T) = wet grip index of the candidate tyre as measured in one test cycleC1 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 ≤ 1,54B 1,25 ≤ G ≤ 1,39B 1,10 ≤ G ≤ 1,24B 1,25 ≤ G ≤ 1,39C 1,10 ≤ G ≤ 1,24C 0,95 ≤ G ≤ 1,09C Empty D Empty D 0,80 ≤ G ≤ 0,94D 1,10 ≤ G ≤ 1,24E 0,95 ≤ G ≤ 1,09E 0,65 ≤ G ≤ 0,79E G ≤ 1,09F G ≤ 0,94F G ≤ 0,64F Empty G Empty G Empty G" (3) Annex IV: Verification procedure, is replaced by the following: (4) the text set out in the Annex to this Regulation is added as Annex IVa.
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
(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.
| Measured parameter | Verification tolerances |
|---|---|
| Rolling resistance coefficient (fuel efficiency) | The aligned measured value shall not be greater than the upper limit (the highest |
| External rolling noise | The measured value shall not be greater than the declared value of |
| Wet grip | The measured value shall not be lower than the lower limit (the lowest value of |
(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.
(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 highestRRC of the tyre set, and the lowestm RRC of the tyre set shall be at least equal to:m (i) 3 kg/t for C1 and C2 tyres; and (ii) 2 kg/t for C3 tyres.
(b) The RRC in the candidate or reference laboratories (m c orl) 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 1143 mm for machines measuring C3 tyres.
(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 greater than 1,5 per cent relative to earlier measurements after correction for any machine drift.m
(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:σ m 1 p i = 1p σ 2 m,i σ m,i 1 n – 2j = 2n Cr i,j 1 n – 1j = 2n Cr i,j 2 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)
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 , B1l , A2c and B2c ) shall be rounded and displayed to 4 decimal places.
(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.
(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.