Debutants
Joaquim Adrego Pereira Andrade is the youngest debutant in GP Costa Azul in 1990. There are 5 debutants.
| # | Rider | Team | Age |
|---|---|---|---|
| 1 | ANDRADE Joaquim Adrego Pereira | Sicasal - Acral | 20y + 180d |
| 2 | CARVALHO Francisco | Avibom - Valouro - Lousa | 20y + 264d |
| 3 | VALENTE Fernando | Calçado Ruquita - Philips - Feirense | 21y + 316d |
| 4 | PEREIRA Delmino | Recer - Boavista | 22y + 173d |
| 5 | MARQUES Diamantino | Orima | 23y + 308d |