The Isle of Man Bank Town Centre Cycle Series has been cancelled.
Organisers say it is down to a lower than anticipated level of entries.
The inconvenience of road closures to local residents and businesses could not be justified with the numbers due to take part.
Castletown, Port Erin, Ramsey, Peel and Douglas were due to host races over the summer months.
All entry fees received will be returned in full within seven days.
Commonwealth Games: Matt Bostock wins gold in points race
Manx cyclist wins Isle of Man's first Commonwealth Games gold since 2006
Salt manufacturer eyes restaurant move
The Isle of Man Salt Company submitted plans for The Boathouse in Port St Mary
Memorial services to mark 53rd anniversary of Summerland Disaster
Fifty people died in leisure complex fire in 1973
Internet provider to increase prices next month
Manx Telecom says it's in line with annual three percent lift