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Join Date: Aug 2007
Location: Northampton, MA
Posts: 956
Bikes: Iron Monkey: a junkyard steel 26" slick-tired city bike. Grey Fox: A Trek 7x00 frame, painted, with everything built, from spokes up. Jet Jaguar: A 92 Cannondale R900 frame, powder coated matte black with red and aluminum highlights.
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If I understand your idea, you'd have to attach the drive shaft to the pedals, then have another crank attached at the axle of the rear wheel to attach. Ratios could be changed by sliding the connection up and down the arms.
However, that's a really complex mechanism sticking way out the sides of the bike.
Also, never, ever read the comments on YouTube. I gotta remember that.