Any hopes a last minute compromise would allow the Mid-Antrim 150 races to go ahead have been snuffed out.
The organising club has upheld its decision originally made in December.
They say there are still major differences between the club and the Motor Cycle Union of Ireland.
T.T. star Adrian Archibald says it's a blow to his sport in Northern Ireland:-
Volunteers wanted to help run 2025 Manx Rally
Event Director says 'next generation' needed in the long term
Athletics: David Mullarkey breaks men's 10,000m Manx Record
It comes just a week after women's record was smashed by Sarah Astin
Football: Corinthians secure 24/25 women's league title
It means a league and cup double for the club this season
Rugby: Mixed end of the season for Manx sides
Douglas record highest ever league finish
Football: Hospital Cup underway
Junior cup also took place at the weekend