@cdamian as range extension, particularly for a loaded touring bike, you would get up to 20% iff there is some place where you're just burning through brake pads. Some lighter and smaller motors might make sense, whether hub drive like a modified EZ motor, or some kind of gearbox with a fixed gearing to the wheel. I'm going up and down hills in a city with cargo & kids, so until now, have been regularly making tiny expensive brake pads into dust with about 500-1000W for 1-2 minutes per hill.