The Team Novo Nordisk development squad and Team Idea have been confirmed for An Post Rás.
The Novo team travel to the race on a mission to represent millions of diabetics worldwide via the five type 1 diabetic riders on the team, including Irishman Daragh Campbell, from Drogheda.
Team Idea last year notched up a number of placings.
The 2015 An Post Rás will begin in Dunboyne on 17 May and will feature stage finishes in Carlow, Tipperary, Bearna, Newport, Ballina, Ballinamore, Drogheda and Skerries.
It will total almost 1,200 kilometres in length and will include 21 categorised climbs.
