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) | |||||||
| 2 |  Standings | ||||||
| 3 |  Mountain | ||||||
| 26-07 | Stage 24Malo-les-Bains - Paris (313.0km) | ||||||
| 25-07 | 3 | Stage 23Charleville-Mézières - Malo-les-Bains (271.0km) | |||||
| 20-07 | 1 | Stage 18Aix-les-Bains - Évian-les-Bains (204.0km) | |||||
| 17-07 | 1 | Stage 15Nice - Gap (233.0km) | |||||
| 08-07 | 3 | Stage 9Pau - Luchon (231.0km) | |||||
| 14-06 | 9 | National Road Championships - Belgium (CN) | |||||
| 22-03 | 13 | Ronde van Vlaanderen (CDM) | |||||