ミカ・カリオ
Andy Ibbott of California Superbike School started training Thomas during the 2005 season. Lüthi scored his first 125cc class Grand Prix win in 2005 at Le Mans, followed by three more victories that season, including one at his team's home race at Brno, Czech Republic. On 6 November 2005 Lüthi secured his first world championship in the 125cc class, the sixth-youngest person to do so; this took place at Valencia. While using a Honda RS125R kit, Lüthi won the world championship title in the 125cc class, being five points ahead of Mika Kallio. Lüthi was voted Swiss sportsman of the year in 2005 and also won the annual "Swiss Award" in the category of sport.