The new Bosch motor is smaller, lighter, more efficient, and simply better: It provides a more natural riding feel when you pedal and doesn't hold you back when you don't; Trek's Removable Integrated Battery System (RIB) looks good and is user-friendly: The battery is fully integrated into the frame and well-protected, easy to remove without tools, and allows space for a bottle cage; The Purion controller features a Walk Assist function and an intelligent eMTB mode that automatically delivers the required power depending on the terrain; The Shimano drive system offers many gears and a wider gear ratio, so you can always find the right cadence and get the most out of the motor.