Trident Trikes is the North American Distributor for Efneo GTRO Gearboxes.
The Efneo GTRO Gearbox is a 3 Speed Internally Geared Crankset Replacement. It will give you an effective gear range identical to having a 28/40/50 Triple Crankset up front, without having to use a front derailleur. You can shift the Efneo whether you are moving or standing still! The Efneo GTRO Gearbox comes in 3 different configurations- Twist Shifter, Trigger Shifter, or Bar End Shifter. For more information visit http://www.efneo.com
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Here is the link for installation manuals and videos. http://www.efneo.com/gearbox/manuals-and-tutorials/