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Old 09-19-10, 05:30 PM   #1
o0adam0o
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Stringbike!

First time ive seen this... thought id share.

http://www.youtube.com/watch?v=ei2ZB...eature=related

http://www.youtube.com/watch?v=z4PAz...layer_embedded
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Old 09-19-10, 05:48 PM   #2
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Very similar to the Alenax Transbar from the 80s, which was very similar to other bikes from earlier times.


Image poached without permission from here.
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Old 09-19-10, 07:22 PM   #3
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they said that different configurations could be used for the "String bike" for racing, etc.
like so many other attempts to "redesign" the bicycle, this one will be vapor.
it only works for pedaling squares. pulling up doesn't do anything on this bike.
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Old 09-19-10, 09:42 PM   #4
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The original design idea dates back to pre WW1 in France where it was produced for a number of years. It is covered in the book "The Dancing Chain", third edition by Frank Berto.

When first introduced it had the advantage of providing a much wider gearing range than other available systems of the time but ergonomically it is poor due to not using the lower legs in a rotating pattern of movement. You have to bring the legs to a stop at the top and bottom of the leg stroke and lift the lowered leg without any help from the other leg.
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Old 09-20-10, 06:46 AM   #5
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I plan to build a lever-pedal bike eventually someday.... (with a dual-independent-lever pedaling system, that allows each leg to pedal independent of the other, and that allows variable pedal stroke lengths).

There are problems with the concept but I suspect that even though it does not allow "pulling up", for most casual and recreational riding it will be more efficient (faster) and result in less injury than conventional round cranks.

Round cranks are mechanically simple and fairly lightweight, but they force the rider to use a fixed leg stroke length all the time. My theory is that allowing variable pedaling stroke lengths would produce significant practical benefits.

-And I tend to agree with the assertion that recreational riders don't pull up on the pedals significantly anyway.
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Old 09-20-10, 07:32 AM   #6
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Obvioulsy not everyone is pulling up when Pedaling. My point was a response to the conpany's statement that they could make race versions.

For recreational riders, I doubt things will ever go to this more complex system. More likely to simpler zero maintenance things like belt drive.
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