All available race results Greg Demgen
| Date | Race | Rank |
| Red Zinger Classic | ||
| 29/07 | General Classification | 8 |
Rider information for 1979
| Rank | 951 |
| Score | 2 |
| Name | Greg DEMGEN |
| Country | United States |
| Team | Individual |
| Date | Race | Rank |
| Coors Classic | ||
| 03/08 | Stage 8 | 4 |
Rider information for 1980
| Rank | 962 |
| Score | 2 |
| Name | Greg DEMGEN |
| Country | United States |
| Team | Individual |
No results available in season 1981.
Rider information for 1981
| Rank | 922 |
| Score | 3 |
| Name | Greg DEMGEN |
| Country | United States |
| Team | Individual |
| Date | Race | Rank |
| 04/09 | World Championships Road Race (Amateurs) | 83 |
| Tour de l'Avenir | ||
| 20/09 | General Classification | 74 |
Rider information for 1982
| Rank | 617 |
| Score | 20 |
| Name | Greg DEMGEN |
| Country | United States |
| Team | 7-Eleven |
No results available in season 1983.
Rider information for 1983
| Rank | 1392 |
| Score | 0 |
| Name | Greg DEMGEN |
| Country | United States |
| Team | Individual |
| Date | Race | Rank |
| Coors Classic | ||
| 21/07 | Stage 8 | 3 |
Rider information for 1984
| Rank | 875 |
| Score | 6 |
| Name | Greg DEMGEN |
| Country | United States |
| Team | Individual |
No results available in season 1985.
Rider information for 1985
| Rank | 1074 |
| Score | 3 |
| Name | Greg DEMGEN |
| Country | United States |
| Team | Levi's |
No results available in season 1986.
Rider information for 1986
| Rank | 1493 |
| Score | 0 |
| Name | Greg DEMGEN |
| Country | United States |
| Team | Levi's - Look - Shimano |