KC48 wrote:
VC105 and AV216... this may be of interest to you... from web address https://194.106.151.95/site/your_journey/bicycles_and_animals.asp

"Carrying Bicycles on Bus Éireann Services"
"Bicycles will be carried on Bus Éireann services in Ireland only if sufficient accommodation is available for them in the luggage compartment of the bus/coach. There may be limited capacity available in the luggage compartment, particularly during the summer months; therefore we cannot guarantee that bicycles will be carried. Cost of carrying a bicycle on a bus/coach is €11.00 per single journey irrespective of distance"

"Folding bicycles which are packed and wrapped in a suitable carrier bag/protective covering will be treated as passengers' accompanied luggage and carried free of charge in the luggage storage area. Folding bicycles which are NOT packed or wrapped as described above will be charged at the full cycle rate"

Think this answers your question, folks!

Additionaly, most drivers don't charge as long as it is declared to them, they will charge if they think you're trying to avoid paying.
And, even if you purchase a ticket for it, capacity for it cannot be guarenteed on a connecting service.