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) | |||||||
| 3 |  Standings | ||||||
| 28-07 | Stage 22Dieppe - Paris (332.0km) | ||||||
| 27-07 | 3 | Stage 21Malo-les-Bains - Dieppe (234.0km) | |||||
| 18-07 | 2 | Stage 14Nice - Grenoble (333.0km) | |||||
| 11-07 | 1 | Stage 10Luchon - Perpignan (323.0km) | |||||
| 06-07 | 3 | Stage 7Les Sables-d'Olonne - Bordeaux (285.0km) | |||||
| 02-07 | 3 | Stage 3Cherbourg-Octeville - Dinan (199.0km) | |||||
| 25-05 | 3 | Bordeaux-Paris (HIS) | |||||
| 05-05 | 6 | Paris - Tours (CDM) | |||||