@ firestarter, have a look at the coach/ ferry deals from stenna. you can get picked up in leeds on a bus eireann coach, then straight onto the ferry at holyhead, then coach takes you from dublin port to train station/ city centre.
all for £62 (if you book 5 days in advance) afaik end of august is not a bh in ireland, so fares shouldn’t change that much.
all this obviously depends on you owning a bike bag, and sorting a train from dub to ballyhoura (charleville will be your closest train station, about 12-14 miles from the trails)
i’m going from leeds, but i’ll have a car full of family who will be staying at my parents in tipp whilst i come last in the race, err … i mean ‘event’ 🙂
if my car becomes empty (divorce or otherwise) i’ll give you a shout 🙂