My daughter is dating a young man who is 7' tall. We would like to find a tandem for them to ride with us. I know we should just set aside the next three month's house payments to buy them a custom tandem (ain't gonna happen) so we are looking for a used tandem that will work. He has something like a 27" frame single, and she is 5'9" so at least we are not looking for something for a giant and a dwarf.
Anybody have some insight as to what you might consider a minimum frame size for him as captain, and what might be the maximum frame size we could go with her as stoker? I've seen some XL frame tandems in the past, but I don't want to go so large that the stoker would have to put blocks of wood on the pedals to reach.
This would only be our third tandem in the stable and still trying to convince myself whether I should find a triplet so we have it, just in case.