All available race results Guillaume Lavoncourt
| Date | Race | Rank |
| 11/03 | Saint-Cloud - Neuilly-sur-Seine - Saint-Cloud | 7 |
Rider information for 1877
| Rank | 31 |
| Score | 19 |
| Name | Guillaume LAVONCOURT |
| Country | France |
| Team | Individual |
| Date | Race | Rank |
| 06/04 | Course d'Ouverture - Paris (S.V.P.) | 7 |
| 02/06 | Paris - Mantes | 3 |
| 19/10 | Paris - Melun - Paris | 4 |
Rider information for 1884
| Rank | 53 |
| Score | 69 |
| Name | Guillaume LAVONCOURT |
| Country | France |
| Team | Individual |
| Date | Race | Rank |
| 06/09 | Paris - Brest - Paris | 7 |
| 04/10 | Paris - Dieppe - Paris | 7 |
Rider information for 1891
| Rank | 27 |
| Score | 269 |
| Name | Guillaume LAVONCOURT |
| Country | France |
| Team | Individual |
| Date | Race | Rank |
| 14/05 | Bordeaux - Paris | 5 |
| 06/06 | Paris - Clermont-Ferrand | 20 |
Rider information for 1892
| Rank | 41 |
| Score | 186 |
| Name | Guillaume LAVONCOURT |
| Country | France |
| Team | Individual |