Hahaha I'm not serious about the 34t, that would be a tree climber for sure . The RD is a Shimano 105 1050 indexed -I think it should certainly be able to handle a 28t. I just gave it all a little stretch and it looks like it would easily go up to that. I just wasn't sure if the Suntour FWs or Hyperglides that pop up in online searches would work or not. Also if I am able to score a 14-28 Shimano -hoping there's a possibility I could replace the 14t with my 13t cog if the splines indeed match up.
Thanks!