All available race results Jan de Jager
| Date | Race | Rank |
| 20/08 | Amsterdam - Utrecht - Amsterdam | 1 |
Rider information for 1905
| Rank | 123 |
| Score | 37 |
| Name | Jan DE JAGER |
| Country | Netherlands |
| Team | Individual |
| Date | Race | Rank |
| 22/07 | Nederlands Kampioenschap | 2 |
| 02/09 | Amsterdam - Utrecht - Amsterdam | 2 |
Rider information for 1906
| Rank | 95 |
| Score | 65 |
| Name | Jan DE JAGER |
| Country | Netherlands |
| Team | Individual |