My latest project with a goal to keep the bicycle light and nimble, but have enough power assist to help me over some hills on the way home. To keep added weight to a minimum, I chose the Leed PBJ package with a 250 watt front hub. Using the throttle button only when needed for a brief boost, the tiny battery stowed in the top-tube bag is enough for a couple of miles. It's a Trek Shift-1 upgraded with components from Craig's List donor bikes.