Info
| Last name | De Keyser |
| First name | Constant |
| Nationality |  Belgium |
| Date of birth | 20-02-1935 |
| Place of birth | Rillaar |
| Passed away | 09-05-2016 |
| Age when passed away | 81 |
Monuments
| Date | Rank | Race | |||||
|---|---|---|---|---|---|---|---|
| Ronde van Belgie (2.3) | |||||||
| 4 |  Standings | ||||||
| 26-05 | 10 | Stage 4bHannut - Brussel (178.0km) | |||||
 Vuelta a España (2.HC) | |||||||
| 24 | Standings | ||||||
| 15-05 | Stage 17bGuernica - Bilbao (53.0km) | ||||||
| 10-04 | 41 |  Paris-Roubaix (CDM) | |||||
| 03-04 | 31 | Ronde van Vlaanderen (CDM) | |||||
Teams
Victories
| This year | 0 |
| Total | 0 |