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Human Powered Vehicle - Named as VIA “The Zip Trike”,the USP of VIA design is that
it has Direct Propulsion of Gears.So the removal of chain as in
conventional Human Powered Vehicles, reduces the friction of the vehicle.
To create large gear ratios, gears are often connected together in gear trains
The right-hand (purple) gear in the train is actually made in two parts, as shown ,
a small gear and a larger gear are connected together, one on top of the other.