All available race results Gustave de Greef
| Date | Race | Rank |
| Bruxelles - Luxembourg - Mondorf | ||
| 24/06 | General Classification | 9 |
| Circuit de l'Ouest | ||
| 26/08 | Stage 1 | 14 |
| 27/08 | Stage 2 | 12 |
| 28/08 | Stage 3 | 37 |
| 29/08 | Stage 4 | 42 |
| 30/08 | Stage 5 | 8 |
| 31/08 | Stage 6 | 12 |
| 01/09 | Stage 7 | 16 |
| 02/09 | Stage 8 | 5 |
| 02/09 | General Classification | 15 |
Rider information for 1934
| Rank | 515 |
| Score | 40 |
| Name | Gustave DE GREEF |
| Country | Belgium |
| Team | Individual |
| Date | Race | Rank |
| 01/05 | Grote 1 Mei-Prijs Hoboken | 16 |
| 05/05 | Paris - Tours | 9 |
| Circuit du Morbihan | ||
| 11/05 | Stage 1 | 12 |
| 30/05 | Circuit de Paris | 16 |
| 23/06 | G.P. de Wallonie | 1 |
| Circuit de l'Ouest | ||
| 25/08 | Stage 1 | 68 |
Rider information for 1935
| Rank | 275 |
| Score | 130 |
| Name | Gustave DE GREEF |
| Country | Belgium |
| Team | Génial Lucifer - Hutchinson |
| Date | Race | Rank |
| 22/03 | Bruxelles - Bellaire | 13 |
| 28/07 | Scheldeprijs - Schoten | 11 |
| Circuit de l'Ouest | ||
| 23/08 | Stage 1 | 57 |
| 24/08 | Stage 2 | 48 |
| 25/08 | Stage 3a | 14 |
| 25/08 | Stage 3c | 7 |
| 26/08 | Stage 4 | 19 |
| 27/08 | Stage 5 | 2 |
| 28/08 | Stage 6 | 17 |
| 29/08 | Stage 7 | 11 |
| 30/08 | General Classification | 14 |
| 30/08 | Stage 8 | 7 |
Rider information for 1936
| Rank | 471 |
| Score | 58 |
| Name | Gustave DE GREEF |
| Country | Belgium |
| Team | Van Hauwaert |
| Date | Race | Rank |
| Tour de Belgique | ||
| 12/05 | Stage 1 | 90 |
| 13/05 | Stage 2 | 65 |
| 14/05 | Stage 3 | 48 |
| 16/05 | Stage 4 | 19 |
| 17/05 | Stage 5 | 8 |
| 17/05 | General Classification | 35 |
| 20/06 | G.P. de Wallonie | 4 |
| 27/07 | Scheldeprijs - Schoten | 11 |
Rider information for 1937
| Rank | 452 |
| Score | 42 |
| Name | Gustave DE GREEF |
| Country | Belgium |
| Team | Van Hauwaert |
| Date | Race | Rank |
| Tour de Belgique | ||
| 18/05 | Stage 1 | 62 |
| 19/05 | Stage 2 | 22 |
| 20/05 | Stage 3 | 25 |
| 21/05 | Stage 4a | 29 |
| 21/05 | Stage 4b | 33 |
| 29/05 | G.P. de Wallonie | 11 |
| 02/08 | Scheldeprijs - Schoten | 20 |
Rider information for 1938
| Rank | 969 |
| Score | 5 |
| Name | Gustave DE GREEF |
| Country | Belgium |
| Team | Van Hauwaert |
| Date | Race | Rank |
| 14/05 | Liège - Bastogne - Liège | 35 |
| Tour de Belgique | ||
| 25/05 | Stage 1 | 72 |
Rider information for 1939
| Rank | 690 |
| Score | 21 |
| Name | Gustave DE GREEF |
| Country | Belgium |
| Team | Van Hauwaert |