| Nation |  |
| First name | Holger |
| Last name | Gardthausen |
| Nickname | |
| Profession | |
| Born on | 00.00.0000 |
| Birthplace |
| Number of races as co-rider | 3 |
| Number of first places | 0 |
| Number of second places | 1 |
| Number of third places | 0 |
| Podiums in percent | 33.33% |
| Total points | 12 |
| Driven EM races | 0 |
| Driven DM races | 0 |
| Driven Bahnpokal | 0 |
| Date | City | Event | Lizenz | Place | Points |
|---|---|---|---|---|---|
| 30.05.1977 | Rastede | offenes Rennen | A-SW | 2 | 8 |
| 26.05.1974 | Rastede | offenes Rennen | B-SW | 8 | 3 |
| 09.09.1973 | Rastede | offenes Rennen | B-SW | 6 | 1 |