The compact SyncDrive Sport 2 motor has Smart Assist technology and is sonically tuned for smooth, quiet performance. It’s tuned to deliver high power, even at low speeds. Smart Assist technology calculates the amount of torque, cadence, slope and speed and, based on these calculations, determines the amount of motor output the rider needs. It feels more powerful due to its ability to support higher cadences and its faster ramp-up in torque.