All available race results George O'Brien
| Date | Race | Rank |
| Milk Race | ||
| 07/06 | Stage 12 | 6 |
| 07/06 | General Classification | 33 |
Rider information for 1958
| Rank | 1135 |
| Score | 5 |
| Name | George O'BRIEN |
| Country | Great Britain |
| Team | Individual |
| Date | Race | Rank |
| Wyścig Pokoju / Závod Míru / Friedensfahrt | ||
| 16/05 | General Classification | 65 |
| Milk Race | ||
| 29/05 | Stage 4 | 20 |
| 31/05 | Stage 6 | 16 |
| 01/06 | Stage 7 | 19 |
| 03/06 | Stage 9 | 20 |
| 06/06 | General Classification | 14 |
Rider information for 1959
| Rank | 678 |
| Score | 17 |
| Name | George O'BRIEN |
| Country | Great Britain |
| Team | Viking |
| Date | Race | Rank |
| Tour de France | ||
| 25/06 | Stage 1a | 129 |
| 25/06 | Stage 1b | 131 |
| 26/06 | Stage 2 | 118 |
Rider information for 1961
| Rank | 1554 |
| Score | 0 |
| Name | George O'BRIEN |
| Country | Great Britain |
| Team | Viking |