All available race results G. Slappendel
| Date | Race | Rank |
| 24/07 | Nederlands Kampioenschap | 9 |
Rider information for 1916
| Rank | 145 |
| Score | 0 |
| Name | G. SLAPPENDEL |
| Country | Netherlands |
| Team | Individual |
| Date | Race | Rank |
| 14/07 | Nederlands Kampioenschap | 11 |
Rider information for 1918
| Rank | 261 |
| Score | 0 |
| Name | G. SLAPPENDEL |
| Country | Netherlands |
| Team | Individual |
| Date | Race | Rank |
| 11/03 | Den Haag - Brussel | 11 |
Rider information for 1923
| Rank | 909 |
| Score | 4 |
| Name | G. SLAPPENDEL |
| Country | Netherlands |
| Team | Individual |