Efneo Gearbox three-speed single-cog crank (black) – 4

Efneo Gearbox three-speed single-cog crank (black) - 4

Overall gear ratio is 179%. 2nd to 1st is -30%, 2nd to 3rd is+25%. Efneo’s gearbox is equivalent to a front crankset with 28T/40T/50T chainring.

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