My wife and I are thinking of getting a tandem bike, so I went and rented one so we could try it out. The problem was that it needed to make it to the house. With no tandem bike rack handy, I did the next best thing and mounted it to my exclusive Old Army ThulYakmia interior bike rack. And guess what? It fits. The limit seems to be about 72" wheelbase with 26" tires on the bike. Go to 700C tires and it might be an inch or so less.