The High Power Gearbox, High Efficiency, works well when extra torque is necessary. great for tracked or off-road vehicles. Two gear ratios are possible, and a RE-260 motor is included. Several types of crank arms, 2 x 80mm shafts,various gears, couplers, nuts and bolts are included for extra flexibility in design. Basic Specifications Gear Ratios: 41.7:1 64.8:1 Motor: RE-260