Division 3 Calculation of wet grip index (G)F1
United Kingdom
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 |