All available race results Josef Dumm
| Date | Race | Rank |
| Großer Opel-Preis von Deutschland | ||
| 05/06 | Stage 6 | 3 |
| 11/09 | Stage 11 | 6 |
| 02/10 | Stage 14 | 8 |
| Olympia's Tour | ||
| 17/08 | Stage 1 | 9 |
Rider information for 1927
| Rank | 398 |
| Score | 55 |
| Name | Josef DUMM |
| Country | Germany |
| Team | Individual |
| Date | Race | Rank |
| 25/03 | Berlin - Cottbus - Berlin | 12 |
| 22/04 | Rund um Köln | 6 |
| 06/05 | Rund um die Hainleite | 5 |
Rider information for 1928
| Rank | 321 |
| Score | 77 |
| Name | Josef DUMM |
| Country | Germany |
| Team | Individual |
| Date | Race | Rank |
| Deutschlandrundfahrt | ||
| 25/05 | General Classification | 19 |
Rider information for 1930
| Rank | 387 |
| Score | 53 |
| Name | Josef DUMM |
| Country | Germany |
| Team | Opel |