All available race results Jean Claessens
| Date | Race | Rank |
| Tour de l'Avenir | ||
| 13/09 | Stage 9b | 5 |
| 17/09 | General Classification | 72 |
Rider information for 1978
| Rank | 674 |
| Score | 9 |
| Name | Jean CLAESSENS |
| Country | Netherlands |
| Team | Individual |
| Date | Race | Rank |
| Tour de l'Avenir | ||
| 13/09 | Stage 9b | 5 |
| 17/09 | General Classification | 72 |
| Rank | 674 |
| Score | 9 |
| Name | Jean CLAESSENS |
| Country | Netherlands |
| Team | Individual |