Have been doing quite a bit of research for over a year on the process of buying a tandem and plan on buying a good quality (Trek, Cannondale, Santanta etc) used bike for our first one. Have already done a test ride on a late 1980s Santana just to see if it is something my wife and I would enjoy and I believe we will - so I continue my search.
In the meantime, I'd like to hear what specific questions I should be asking sellers (especially if they are not local to my area where I can actually see the bike) as I evaluate the bike they are selling. If there is a collection of these somewhere on the forum or elsewhere on the web, feel free to shoot me over to them!
For instance, I imagine replacing the chains on a tandem isn't the cheapest thing. So is there a way of telling how much life the chains on a used tandem may still have in them? I know that on some (all?) tandems the timing chain is adjusted via an eccentric bottom bracket, so it would seem logical that there may be a way of telling how much adjusting has already been done and how much further one could adjust before a new chain is needed?
What other tandem "parts" should I keep an eye on when evaluating used tandems?