All available race results Karel Leyten
| Date | Race | Rank |
| Ronde van Nederland | ||
| 16/05 | General Classification | 29 |
| Tour de l'Avenir | ||
| 21/06 | Stage 2 | 2 |
| 26/06 | Stage 7 | 6 |
| 28/06 | Stage 8 | 9 |
| 03/07 | General Classification | 62 |
Rider information for 1965
| Rank | 493 |
| Score | 41 |
| Name | Karel LEYTEN |
| Country | Netherlands |
| Team | Flandria - Roméo |
No results available in season 1966.
Rider information for 1966
| Rank | 1160 |
| Score | 0 |
| Name | Karel LEYTEN |
| Country | Netherlands |
| Team | Caballero |
| Date | Race | Rank |
| Paris - Nice | ||
| 15/03 | General Classification | 74 |
| 15/04 | Amstel Gold Race | 35 |
Rider information for 1967
| Rank | 526 |
| Score | 24 |
| Name | Karel LEYTEN |
| Country | Netherlands |
| Team | Willem II - Gazelle |