I have a vintage (165mm-Crnk) Sugino 40/48 on here now, but am looking to add some gear range for up hill with med-sm load. I have a Tiagra short cage RD and a Sora double FD. I am friction shifting. I'm considering doing a chain ring like 26/36/48 with an 11-34 freewheel which would give me adequate range, I believe 20-117 ish.
Can I add a chainring to my set? Mine is 110mm 5 arm which sems like it should be replaceable with say a Shimano. I was also thinking I could just get a smaller maybe 36 tooth and call it a day with 2 rings.
My understanding so far is that my Tiagra rear derailleur has maximum of 28T. I've heard of people friction shifting using a double FD for triple front rings. Has anyone seen this?