The 2012 End-2-End mountain bike race has reached full capacity within a week of registration opening.
The sheer volume of cyclists wanting to compete in the 46-mile challenge saw organisers increase the event's capacity to 1,700 last year.
Organiser Steve Honeybone said: ‘The level of interest is amazing but we have to cap it for the riders' safety.’
More than 650 riders will travel to the Island to compete in the race in September.
Interim FC IoM boss praises squad for adapting well to managerial change
Rick Holden has been in charge of the Ravens for almost six weeks
Netball: Manx Rams beaten in Singlife Nations Cup opener
Isle of Man lose 61-37 to Singapore
Pinnington rescues Ravens against Longridge Town
FC Isle of Man score late equaliser to maintain unbeaten run
FC Isle of Man keen to maintain unbeaten run on home return
Ravens hoping to move further clear of drop zone when they face Longridge Town
Jiu-jitsu: Double European gold for Hayley Curtis
Island fighter secures successes in Rome