Efneo Gearbox three-speed single-cog crank (black) – 3

Efneo Gearbox three-speed single-cog crank (black) - 2

You can change gears when you are not pedaling. You can change gears under load when upshifting a gear. You have to loosen your leg a bit when downshifting a gear (like in most bicycle gearboxes on the market).

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