I'm planning on brazing 2 older road frames together to make a tandem bike. I'm not worried about the wheels, I'm planning on having very strong wheels for the load, as well as installing a new fork and brazing on some cantilever bosses on the seat stays.
The question I have is in regard to the strength of the 4130 tubing used on the Taiwan made Schwinns I'm thinking of using. The smaller stoker size will be a Traveller ('85?) the other will probably be a larger, similar Schwinn. Sheldon Brown recommends mountain bikes with 4130 tubing, but this is a road tandem. What do you think?