Hi, My wife and I enjoy riding together and after riding an old Schwinn around a bit we have decided to build up a tandem for road riding.
I make bicycle frames for a living and have some of what I need to make build a tandem frame from 7005 aluminum. I don't care for the EBB solution for chain tension so I will make some type of tension or guide system. Mostly because of the time it takes me to position my saddle.
The strongest/largest head tube platform I have available in 7005 is a large 2" diameter tube to fit the 44mm cups (1-1/8 flush). I have cutters for onepointfive but no tube is available to accommodate those cups. A very large 65mm tube will be used for the down and boom tubes. I am not sure how much shaping I want to do on the boom tube (perhaps just shape the ends rectangular to fit BB shells) but the down tube will be bi-round and 75X50.
I am going to use paul brakes at the rims and a BB7 mounted to a triangulated seat stay (actually an MTB chainstay used as seat stays).
I have the front drawn to match my current road bike and stoker Lanie is short and likes an upright position so the back is 28"
29'r wheels (135)
9 speed 105/XT
(proposed gears) 53/38/28
tandem by frankthewelder, on Flickr
More pics as some progress is made. Thanks for lookin'