Originally Posted by nfmisso

Are your current derailleurs not functioning properly? New Shimano stuff - even the bottom end - works better than almost all of the components from 15+ years ago. Unless you are hung up on period specific components, use new stuff. It is cheaper, and easier to find. For a Mesa Runner, I would not worry about period specific. If you were talking about a Cimarron or PDG; that is an entirely different matter.

I would keep thumb shifter, Sunrace offers some friction thumbies for a reasonable price.

Here is my PDG: IMG_20150119_081222_510_zpsaovacrtg.jpg Photo by Nigel_F_Misso | Photobucket