Freewheeling on Pearse street sorted me out with a 20" one a few weeks ago when I just walked in. They have a Marathon plus display stand and seem to have most or all sizes. You would have to call to check.

And the bike lane (and road) FULL of broken glass this morning

I mailed all my TDs when our creche pulled out of the core funding in order to increase fees. A price rise and government subsidy gone in one go 🤬

You can ask @seamas.bsky.social how it goes in his next issue.