I saw this unusual tandem bicycle in Santa Cruz last week. I'm trying to figure out some of the weird features of this tandem.
How does that big ring inside the timing chain stay in place?
What is that extra set of cranks under the stokers bars for? Russ suggests these might be hand cranks, but I think they might allow a very short rider to pedal recumbent style.
What about that handle that appears to stick out obliquely from the stoker's saddle? Another hint that this might be for a short rider?
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With enough tension, the chain can hold the big ring in place by itself. He's probably using the ring as a DIY chain tensioner. doesn't seem particularly stable, though - either an impact or a jam at either end of the chain would be enough to dislodge it.