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.
For example,
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.
For example,
- 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.
+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.
I also think the second crankset is for the recumbent position and the handle at the rear is for the same.
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.
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.
# posted by 
: 8/24/2009 07:43:00 PM
: 8/24/2009 07:43:00 PM
Apparently it's called a "ghost" or "phantom" chainring.
http://www.mtbr.com/ssfaqcrx.aspx#ssCompTensioners
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http://www.mtbr.com/ssfaqcrx.aspx#ssCompTensioners
# posted by : 8/24/2009 09:32:00 PM
: 8/24/2009 09:32:00 PMLinks to this post:
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