1985 Schwinn 12 speed Shimano 105 rear derailleur?
I recently bought a 1985 Schwinn Traveler. Its a 12 speed, 6 rear cogs, 14T-40T. I would like to replace the existing Suntour rear derailleur with a Shimano 105. can I do it? Will it fit? What should I know? I would like to do this myself rather than LBS but feel bad asking them for their knowledge and then buying on ebay.