| Nation |  |
| First name | Harm |
| Last name | Tjassing |
| Nickname | |
| Profession | |
| Born on | 00.00.0000 |
| Birthplace |
| Number of races as rider | 1 |
| Number of first places | 1 |
| Number of second places | 0 |
| Number of third places | 0 |
| Podiums in percent | 100% |
| Total points | 13 |
| Driven WM races | 0 |
| Driven EM races | 0 |
| Driven DM races | 0 |
| Driven Bahnpokal | 0 |
Performance from Harm Tjassing compared to the following drivers
| Opponent | Pic | Country | Meetings |  |  | Won |
|---|---|---|---|---|---|---|
| Roel Liemburg |  | | 1 | 0 | ||
| Jos Wijns | | | 1 | 0 | ||
| Peter Steutel | | | 1 | 0 |
| Date | City | Event | Lizenz | Place | Points |
|---|---|---|---|---|---|
| 05.05.1989 | Ermelo | offenes Rennen | A-SW | 1 | 13 |