All available race results Jonker
| Date | Race | Rank |
| 12/08 | Nederlands Kampioenschap | 14 |
Rider information for 1907
| Rank | 727 |
| Score | 0 |
| Name | JONKER |
| Country | Netherlands |
| Team | Individual |
| Date | Race | Rank |
| 12/08 | Nederlands Kampioenschap | 14 |
| Rank | 727 |
| Score | 0 |
| Name | JONKER |
| Country | Netherlands |
| Team | Individual |