Part A: Fuel efficiency classes
United Kingdom
F1The 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.
If a tyre type is approved for more than one tyre class (e.g. C1 and C2), the grading scale used to determine the fuel efficiency class of this tyre type should be that which is applicable to the highest tyre class (e.g. C2, not C1).
| C1 tyres | C2 tyres | C3 tyres | |||
|---|---|---|---|---|---|
| RRC in kg/t | Energy efficiency class | RRC in kg/t | Energy efficiency class | RRC in kg/t | Energy efficiency class |
| RRC ≤ 6,5 | A | RRC ≤ 5,5 | A | RRC ≤ 4,0 | A |
| 6,6 ≤ RRC ≤ 7,7 | B | 5,6 ≤ RRC ≤ 6,7 | B | 4,1 ≤ RRC ≤ 5,0 | B |
| 7,8 ≤ RRC ≤ 9,0 | C | 6,8 ≤ RRC ≤ 8,0 | C | 5,1 ≤ RRC ≤ 6,0 | C |
| Empty | D | Empty | D | 6,1 ≤ RRC ≤ 7,0 | D |
| 9,1 ≤ RRC ≤ 10,5 | E | 8,1 ≤ RRC ≤ 9,2 | E | 7,1 ≤ RRC ≤ 8,0 | E |
| 10,6 ≤ RRC ≤ 12,0 | F | 9,3 ≤ RRC ≤ 10,5 | F | RRC ≥ 8,1 | F |
| RRC ≥ 12,1 | G | RRC ≥ 10,6 | G | Empty | G |