All available race results J. McMahon
| Date | Race | Rank |
| 11/10 | Warrnambool - Melbourne | 84 |
Rider information for 1924
| Rank | 1214 |
| Score | 0 |
| Name | J. MCMAHON |
| Country | Australia |
| Team | Individual |
| Date | Race | Rank |
| 05/10 | Warrnambool - Melbourne | 38 |
Rider information for 1929
| Rank | 1245 |
| Score | 0 |
| Name | J. MCMAHON |
| Country | Australia |
| Team | Individual |