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veganboyjosh@gmail.com wrote: | just get a loose sprocket or chainwheel that's larger than the cog, and that | filles out the chain somewhere between the cog and the chainwheel. the chain | would then not go in a straight line from bottom of CW to bottom of FW, and | vice versa, but from bottom of CW to bottom of floating chainwheel, to | bottom of freewheel; from top of FW to top of floating chainwheel, to top of | chainwheel. hard to put into words, but if you can figure it out, it works | awesomely. at first, it seems like it wouldn't work, or it would require a | specific number of teeth in order not to walk to the front or the rear, but | the truth is that the chain is moving forward (at the top of the loop) just | as fast/many links as it is moving backwards (at the bottom of the loop.)
from wikipedia's entry on "fixed-gear bicycles":
~ * A "Ghost" or "floating" chainring. An additional chainring placed in the drive train between the driving chainring and sprocket. The top of the chain moves it forward at the same speed that the bottom of the chain moves it backwards, giving the appearance that it is floating in the chain.
i'm pretty sure i know the tallbike you're talking about, josh, but i can't seem to find the photo, either. but the marvelous atomic zombie provides us with this:
http://www.instructables.com/files/deriv/F5W/VGOF/B01ES9J3YPJ/F5WVGOFB01ES9J...
leave it to the freak bikers to invent the problem *and* the solution, then export it to the rest of the world!
- -bB
chiBikeProject