| Deflections class | C1 | C2 | C3 | C4 | C5 | C6 |
| Cd value (×1/100 mm) | 0 - 49 | 50 - 74 | 75 - 99 | 100 - 149 | 150 - 199 | 200 - 300 |
| Level of deflexion | Low | Medium | High | Very high | ||