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The Ebii, the first electric bike from consumer-­electronics company Acer, has plenty of futuristic flourishes: a proximity sensor that automatically locks the bike when you walk away; built-in GPS to help in case of theft; a smooth, carbon belt instead of a greasy chain; and a battery that pops off and doubles as a portable charger for your laptop and phone. But it’s the algorithmic smarts that set this bike apart. Sensors understand your pedaling force and elevation, and automatically adjust the electric power-­assistance level for a smooth ride. No more gears.

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