Glenn Irwin, who won 11 races at the North West 200, has announced his retirement from road racing.
Irwin, 34, says the decision is to focus on winning the British Superbike Championship.
The Northern Ireland rider has finished second and third in the BSB standings in the past two seasons.
Riding for PBM Ducati, he missed out to Tommy Bridewell in 2023 by just 0.5 points and was third behind champion Kyle Ryde and Bridewell this season.
“I believe this news will help shape my career in search of my first British Superbike title,” Irwin said on his social media.
“Thirty-four may seem young but I achieved so much more than what I ever dreamed off.”
Irwin made his debut at the North West 200 in 2015 and has become the most successful rider in the Superbike class in the event’s history.
He claimed a hat-trick of victories at the 2024 event as he made it 11 wins in a row in the Superbike class.
He made his sole appearance at the Isle of Man TT in 2022, where he was the fastest newcomer at the event, and he competed at the Ulster Grand Prix at the start of his career.