Todd, the inventor of the Stokemonkey says, “Your timely and appropriate shifting permits the motor to operate within a small band of powerful and efficient speeds at all times. This is key.”
As a roadie, I was reminded of that saying, “stay on top of the gear” and found Bettie’s sweet spot within a few minutes of riding. When the Stokemonkey bogged down a bit, I’d shift, and the motor assist would pick up speed again. After a few longer rides, I could tell how well the Stokemonkey was operating by the vibrations in the seat tube and also hear it cranking away. In the video, I’m rolling up a gently sloped, 5% grade hill.