Our patented electric motor assist kit for cargo bikes. Stokemonkey gives the power and confidence needed for the heaviest loads. Fits Xtracycle FreeRadical and Edgerunner, as well as Yuba Mundo and Surly Big Dummy. Includes: Geared motor, 25A controller, throttle, CA3-DPS, clampset, bracket, 50t stoker crank and 30-29-50 drive side crank, 16t fixed cog, cable tensioner, chain. Recommended for use with a 48V battery. Installation and battery not included.