Mid-Drive motors, commonly manufactured companies like Bosch, Shimano, and Brose, work by mounting directly to the pedals and drive system. They use a system of sensors and computers to calculate how hard you're pedaling in order to deliver further electrical assistance. Mid-Drive's feel incredibly natural and comfortable in the way they assist you. This is due to their ability to work in conjunction with the bike's drivetrain, giving you a smooth "bike-like" feeling.