In 2005, the Bavarian was invited by five-time world champion Toni Mang to his motorcycle training sessions at the Hockenheim and Salzburgring circuits, where he impressed.

Since 2007 Schrötter has been coached and supported by Toni Mang, who takes care of sporting and technical matters, as well as finding sponsors.

Schrötter competed for the Toni Mang team on Honda RS125 in the 125cc class of the International German Motorcycle Championship (IDM).

As the season progressed, Schrötter achieved a further four victories, narrowly beating Dutchman Joey Litjens in the overall standings to win the eight-liter title.

After finishing second at the Salzburgring, Schrötter secured his second German championship title at the age of 16, with victory at the Schleizer Dreieck on August 2, 2009, two rounds before the end of the season.

He had an awful start to the year, finishing in the points only once in eight races, a 12th place in Le Mans, and so he was dropped by Mahindra, being replaced by Riccardo Moretti.

Luckily for Schrötter, in the 2012 Moto2 World Championship, Ángel Rodríguez also had a weak start to the season, and was dropped by SAG Team after eight non-point scoring races.

Schrötter was partnered at SAG Team by Xavier Siméon for the 2013 Moto2 World Championship, and the pair scored solid points throughout the season.

Needing a change of scenery, Schrötter was signed by AGR Team, to partner Axel Pons in the 2016 Moto2 World Championship.

With Jonas Folger moving up to the MotoGP class, a spot opened up next to Sandro Cortese on the other Dynavolt Intact GP bike.

He would add one more podium during the year, at his home German Grand Prix at the Sachsenring, finishing behind Álex Márquez and Brad Binder, the first two riders in the standings, fighting for the title.

Schrötter would score his final podium up-to-date in the 2020 season of the Moto2 class Austrian GP, finishing behind Jorge Martín and Luca Marini.

4th in Austin, 4th in Portimao, 5th in Jerez, 6th in Le Mans, 9th in Mugello, 5th in Barcelona, and a 4th place at his home German GP meant that he was steadily in the top-10 of the championship.

On September 3 however, shortly after the end of the summer break, Schrötter announced that this was his last season with the Intact GP Team,[9] and he will be looking for a new challenge in 2023.