All available race results Robert Hastings "Bob" Diefenbacher
| Date | Race | Rank |
| 10/11 | Six Days Boston | 8 |
Rider information for 1912
| Rank | 1222 |
| Score | 0 |
| Name | Robert Hastings "Bob" DIEFENBACHER |
| Country | United States |
| Team | Individual |
| Date | Race | Rank |
| 10/11 | Six Days Boston | 8 |
| Rank | 1222 |
| Score | 0 |
| Name | Robert Hastings "Bob" DIEFENBACHER |
| Country | United States |
| Team | Individual |