All available race results Johannes Harmannus Postma Tz.
| Date | Race | Rank |
| 10/06 | Groningen - Leeuwarden - Groningen | 5 |
| 16/09 | Leeuwarden - Sneek - Leeuwarden | 1 |
Rider information for 1894
| Rank | 168 |
| Score | 46 |
| Name | Johannes Harmannus POSTMA TZ. |
| Country | Netherlands |
| Team | Individual |