Here is a link to an automatic liquid drive CVT system that has been perfected
for bicycles according to the manufacturer. Fluid pressure from the pedal pump
is converted to wheel rotation through a hydraulic motor. Among other advantages
are internal hydraulic brakes, a liquid smooth infinite gearing-cadence
management system and best of all, elimination of the chain and derailers. Well
worth reading and viewing videos.

http://www.powerengine.com/actx000bsldshw2.htm

Ray in Woodbury :O)

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