Unusual Tandem Bicycle

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Monday, August 24, 2009
By Yokota Fritz


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.

Weird tandem

For example, Your thoughts?


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Comments:
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.
 
+1 for chain tensioner. Without it, the chain was probably 1/2 a link too long.

I also think the second crankset is for the recumbent position and the handle at the rear is for the same.
 
is that a motor in the rear hub and possibly batteries in the bag?
 
I think the post from the stokers seat and the cranks under the bars are for a child, the child seat clips to the bar from under the stoker and the Kid gets to peddle, to.
 
Jasper, that looks almost like a hub motor but that's an Arai drum brake.

Cliff -- Aha! I thought of that bar as a handle for the child but your idea makes better sense.
 
Bet that free-floating tensioner pops out all the time when you hit an inconvenient bump. Either that, or he's just messing with us.
 
Apparently it's called a "ghost" or "phantom" chainring.

http://www.mtbr.com/ssfaqcrx.aspx#ssCompTensioners
 
That's really interesting and I've nver seen that before!
 
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