Fallbrook Technology will manufacture (and has already licensed to
Ellsworth Cycles) this new Constant Velocity Transmission hub, named
NuVinci. It has continuous ratios from 1:1 to 3.5:1, but is made as a
normal freewheeling bike hub. Maybe they could be persuaded to make a
fixie version?
http://www.fallbrooktech.com/NuVinci.asp


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