Although it is widely believed that he is an Aragonese rider, Grávalos is Navarrese by birth and has grown up in La Rioja, where he lives; specifically in the small town of Cervera del Rio Alhama. The rider arrived last season on the Kometa Cycling Team, the last step up from when he began to practice this sport. Originally, however, he started in swimming. From the swimming pool he jumped to the world of triathlon in the hands of the Huesca La Magia club, where he remained until his campaign as a second year cadet. During this time, the bicycle was gaining weight in his daily life, but the consolidation of his preeminence came because some training partners saw him still much room for improvement. It is at the time he moves to the junior category that he focuses specifically on road cycling. In 2019, in his first year with the Foundation, he was forced to finish the season earlier than planned due to a traffic accident in which he injured his left hand and had to go into surgery. In 2020, his fourth season as u23, he was able to compete as stagiaire with the continental team in both the Tour de Hongrie and the Ordiziako Klasika, showing his great fighting spirit in both.
- 10º / Trofeo San José
- 2º / Spanish U23 Championship Route
- 2º / Stage 3 Vuelta a Zamora
- 6º / Spanish U23 Championship ITT
- 18º / Stage 3 Giro de Italia U23