CFMoto Aspar Team (2025–2026)
On 15 November 2024, Aspar Team announced Quiles as their Moto3 rider for the 2025 season, alongside Dennis Foggia. He missed the first two rounds of the season due to being under the age limit for riders who have finished in the top-three in the JuniorGP. Quiles made his Grand Prix debut at COTA, where he qualified second, being only beaten by David Muñoz by a margin of one tenth. He finished the race in fifth place.
Ahead of the Qatar round, Quiles suffered an incident in which he hurt his hand, but still traveled to the circuit. However, after undergoing a medical evaluation, he was diagnosed with a thumb fracture and consequently declared unfit to race that weekend. Two weeks later, ahead of the Spanish Grand Prix at Jerez, his team announced he would miss a second race in order to continue his recovery process. Quiles returned for the French round, where he achieved pole position, and finished the race in seventh place. He would finish the following two races, in Silverstone and Aragón, in second place before claiming his maiden win at Mugello.
The next round at the Dutch TT was the weakest weekend for Quiles up until that point, finishing in 15th place after a crash, which was followed by back-to-back second places at the German and Czech Grands Prix, respectively, and later a fourth place finish at the Austrian Grand Prix. Quiles' good season continued at the Hungarian Grand Prix as he took his second win of season, with a race that went all the way down to the wire with fellow rookie Valentin Perrone at Balaton Park Circuit. He continued to impress with his results as the season progressed, and claimed the rookie of the year award at the Malaysian Grand Prix. At the Portuguese Grand Prix, Quiles won the race in dominating fashion after pulling away from the rest of the field in the final laps. At the end of the season, Quiles finished third in the championship and won the Rookie of the Year award.
In 2026, Quiles clinched the Moto3 World Championship title with a victory at the Indonesian Grand Prix at Mandalika. His tenth win of the season secured the championship with five rounds remaining, making him the fourth rider in Grand Prix motorcycle racing history to clinch a world title this early, after Mike Hailwood, Giacomo Agostini, and Marc Márquez.
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