This is my Surly winter bike: It’s Awesome! It has a 1000W motor with a 48 volt battery. I built this ebike because riding in the winter with one speed through slushy snow sucks. I have also equipped it with scwalbe winter marathon studded tires. I am passing cars and everything else left right and centre. Goes top speed measured with my GPS at 47 km/h and lasts about 30km full tilltin with no pedal assist. I ride to work and back pedal assited for four days before I recharge it. Take that, Winter!