Info
| Last name | Demuysere |
| First name | Jef |
| Nationality |  Belgium |
| Date of birth | 26-07-1907 |
| Place of birth | Wervik |
| Passed away | 30-04-1969 |
| Age when passed away | 61 |
| Place of passing | Antwerpen |
Monuments
| Date | Rank | Race | |||||
|---|---|---|---|---|---|---|---|
 Tour de France (2.HC) | |||||||
| 8 |  Standings | ||||||
| 31-07 | Stage 21Amiens - Paris (159.0km) | ||||||
| 29-07 | 2 | Stage 19Charleville-Mézières - Malo-les-Bains (271.0km) | |||||
| 06-07 | 2 | Stage 1Paris - Caen (208.0km) | |||||
 Giro d'Italia (2.HC) | |||||||
| 2 | Standings | ||||||
| 05-06 | Stage 13Torino - Milano (271.0km) | ||||||
| 26-05 | 3 | Stage 8Foggia - Napoli (217.0km) | |||||
| 24-05 | 3 | Stage 7Lanciano - Foggia (280.0km) | |||||