I consider anything over 500 watts to be getting into motorbike territory. I’m talking about a bicycle. All I need from the motor is enough assistance to offset the weight and rolling resistance of the big wheels - and then a little extra. I still like to pedal myself. My current bike has 5.05" tires, and 250W of pedal-assist is more than enough to take me anywhere I want to go. The limiting factor isn’t power - it’s range.