All available race results Wilhelm Siewert
| Date | Race | Rank |
| Quer durch Deutschland | ||
| 25/05 | Stage 4 | 3 |
| 26/05 | Stage 5 | 7 |
| 27/05 | Stage 6 | 3 |
| 17/09 | Rund um Mitteldeutschland | 6 |
Rider information for 1911
| Rank | 268 |
| Score | 56 |
| Name | Wilhelm SIEWERT |
| Country | Germany |
| Team | Individual |
| Date | Race | Rank |
| 17/03 | Berlin - Cottbus - Berlin | 4 |
| 02/06 | München - Zürich | 11 |
| 25/08 | Rund um Berlin | 4 |
| 29/09 | Ostdeutsches Straßenderby | 4 |
Rider information for 1912
| Rank | 115 |
| Score | 165 |
| Name | Wilhelm SIEWERT |
| Country | Germany |
| Team | Individual |
| Date | Race | Rank |
| 30/03 | Berlin - Leipzig - Berlin | 2 |
| Völkerschlacht-Jubiläumsfahrt | ||
| 19/04 | Stage 1 | 13 |
| 18/05 | Zürich - München | 9 |
| 12/10 | Strassenmeisterschaft von Deutschland | 12 |
Rider information for 1913
| Rank | 203 |
| Score | 77 |
| Name | Wilhelm SIEWERT |
| Country | Germany |
| Team | Individual |
| Date | Race | Rank |
| 15/03 | Berlin - Cottbus - Berlin | 9 |
| 22/03 | Leipzig - Berlin - Leipzig | 8 |
| 17/05 | Rund um Köln | 3 |
| 24/05 | Großer Sachsenpreis | 9 |
Rider information for 1914
| Rank | 145 |
| Score | 106 |
| Name | Wilhelm SIEWERT |
| Country | Germany |
| Team | Individual |
| Date | Race | Rank |
| 05/10 | Strassenmeisterschaft von Deutschland | 4 |
Rider information for 1919
| Rank | 310 |
| Score | 21 |
| Name | Wilhelm SIEWERT |
| Country | Germany |
| Team | Individual |
| Date | Race | Rank |
| 26/09 | Strassenmeisterschaft von Deutschland | 4 |
Rider information for 1920
| Rank | 870 |
| Score | 0 |
| Name | Wilhelm SIEWERT |
| Country | Germany |
| Team | Individual |
| Date | Race | Rank |
| 20/03 | Berlin - Cottbus - Berlin | 1 |
| 28/03 | Großer Straßenpreis der Deutschen Filmindustrie | 10 |
| 24/04 | Rund um Köln | 3 |
| 01/05 | Bayerische Rundfahrt | 5 |
| 16/05 | Rund um Leipzig (Geldfahrer) | 2 |
| 22/05 | Rund durch Sachsen | 2 |
| München - Berlin | ||
| 23/07 | Stage 1 | 11 |
| 21/08 | Strassenmeisterschaft von Deutschland | 5 |
| 18/09 | Rund um Berlin | 6 |
Rider information for 1921
| Rank | 73 |
| Score | 319 |
| Name | Wilhelm SIEWERT |
| Country | Germany |
| Team | Individual |
| Date | Race | Rank |
| 02/04 | Berlin - Cottbus - Berlin | 11 |
| 14/05 | Rund um Köln | 12 |
| Großer Preis von Deutschland | ||
| 18/07 | Stage 1 | 12 |
| 19/07 | Stage 2 | 3 |
| 21/07 | Stage 3 | 13 |
| 23/07 | General Classification | 3 |
| 23/07 | Stage 4 | 4 |
| 20/08 | Strassenmeisterschaft von Deutschland (Gr. Strassenpreis Hannover) | 12 |
Rider information for 1922
| Rank | 137 |
| Score | 143 |
| Name | Wilhelm SIEWERT |
| Country | Germany |
| Team | Individual |
| Date | Race | Rank |
| 22/05 | Rund um Spessart und Rhön | 9 |
| 08/07 | Rund um Frankfurt | 9 |
| München - Berlin | ||
| 22/07 | Stage 2 | 8 |
| 22/07 | General Classification | 8 |
| 26/08 | Rund um Berlin | 11 |
Rider information for 1923
| Rank | 199 |
| Score | 108 |
| Name | Wilhelm SIEWERT |
| Country | Germany |
| Team | Individual |
| Date | Race | Rank |
| 13/07 | Rund um Köln | 7 |
| Zürich - Berlin | ||
| 17/07 | Stage 1 | 11 |
| 04/08 | Strassenmeisterschaft von Deutschland (Rund um Frankfurt am Main) | 10 |
| 07/09 | Rund um Berlin | 10 |
Rider information for 1924
| Rank | 278 |
| Score | 74 |
| Name | Wilhelm SIEWERT |
| Country | Germany |
| Team | Individual |