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Which bike will seat my partner as close to me as possible?
That would have to be the Love Bike: http://www.lovebike.com/specs.htm
As for conventional tandems, an older Schwinn Paramount, Gitane, Jack Taylor, and many other tandems built before the mid-80's will tend to have fairly short top tubes.
or the side-by-side BuddyBike.
Our local former Schwinn dealer has a very well-documented Schwinn Paramount from the early '60s which has a very short top tube, indeed. Of course it is strictly a racing bike and has very agressive geometry, especially compared to the models built today.
Originally Posted by TandemGeek