Bicycles are generally made of metal or aluminium which is recyclable.
Check the waste services locator on this site for recycling options. There are also bicycle refurbishment projects listed on www.crni.ie
Even bicycles in poor condition can be repaired, refurbished and re-used. Check here for Ireland’s online repair directory.
However if your bicycle is beyond repair the main parts of your old bike can be recycled at your nearest civic amenity site.