The trek powerfly 9 fs plus electric bike 2017 makes mountain biking even more fun building upon trek39s proven off road legacy to create a supremely capable bike that allows you to go further and have more fun powered by the bosch performance cx pedal assist system this rugged system delivers a maximum torque of up to 75 newtom metres sustained power into the high cadence range for sporty acceleration as well as a sleek mid mount motor for ideal weight balance and obstacle clearance