For the last several months here, I rode an old Cannondale Synapse with a Claris groupset - not amazing, but I really liked the frame, and it's actually the first indexed shifting road bike I ever used extensively.
Back home I have my old Klein Performance (circa 84'), with the original Suntour Superbe groupset, but I busted its front derailleur before leaving. I want to upgrade its groupset to a more modern indexed one, thinking of buying used on ebay before flying back.
I've always bought used bikes, so I'm looking on ebay for nice finds.
The options I'm more interested in are old Dura Ace 7700 9s, and old 8-10s Campagnolo Chorus. or Campagnolo record if I can get a good deal.
But I realize that I'm not sure how much wear and tear should come into consideration...
Assuming the chainrings are in good condition (no shark fins etc), can I expect a 25 year old derailleur to operate smoothly enough to be happy with it? Or will I be better off spending the same money on a new Shimano 105?
Other relevant questions - 1. Should there be any issues fitting these relatively-newer components on my old frame and wheels? (the Klein has old Wheelsmiths, I'm not sure of the model, I'll try to post a pic). 2. is there an easy adjustment I can make to use the Campagnolo groupset, or will I have to buy Campagnolo wheels to fit it? TIA