Efneo GTRO 3-Speed Internally Geared Crankset


GTRO Gearbox

Are you like most people that really don’t like all the hassles and problems associated with a front derailleur? Now you have an alternative.

Efneo’s GTRO 3-speed front gearbox is perfect for trekking, hybrid, urban, single speed, city and folding bikes as well as for off road non-competition bikes and e-bikes.


Gear ratioGTRO’s 1st gear is a neutral gear (1:1). Second and third gears are incremental. GTRO’s standard chainring is 28T.

Gear Ratio Teeth equivalent for 28T
1st 1:1 28T (phisical chainring size)
2st 1:1,43 40T (phisical chainring size)
3st 1:1,79 50T (phisical chainring size)
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