I just picked up this 1985 Columbia Twosome tandem. The tires hold air but the cables are seized and the chains are stiff. Once those two issues are fixed it will be rideable. I plan to restore it. If my wife won't ride it with me my son & daughter-in-law will ride it. I also have an older Schwinn tandem and a bare Schwinn tandem frame that I plan to restore and build. The bare frame might get an upgrade with mountain bike wheels and parts.