The 2019 Trek Powerfly FS 4 is a full suspension electric mountain bike with 130mm of travel, a Bosch Performance CX motor & a 10-speed drivetrain. Powerfly FS 4 is the gateway to more exciting trail adventures. Its a full suspension electric mountain bike that pairs the capability of a 130 mm trail bike with the power of a Bosch Performance CX motor. A 10-speed drivetrain, aluminium frame with a semi-integrated battery, pedal-assist up to 15.5 mph, & front & rear suspension help you take on more rugged trails with comfort & confidence. A durable Alpha Aluminium frame, a semi-integrated 500 Wh battery & a Bosch Performance CX motor with an ergonomic Purion controller. Plus, 130 mm front & rear travel, an SR Suntour XCR 34 suspension fork with an adjustable air spring, a 10-speed Shimano drivetrain & hydraulic disc brakes. Full suspension lets you take on bigger, more technical trails. Its more comfortable, more efficient & faster in rough terrain. Youre getting great parts & a powerful Bosch e-MTB system, but the biggest advantage of Powerfly FS 4 is the suspension package built for better riding on rugged trail adventures. This Bike Is Perfect For You like singletrack trails & want an e-MTB with a more capable full suspension set-up so you can take on more rugged adventures & stay comfortable & efficient when you do. Key Features For e-MTB, full suspension is a game-changer: it soaks up rugged terrain, so you can ride the Bosch pedal-assist system to its full potential It rides like a mountain bike because it is one: it has the same frame & suspension tech that weve refined in our decades-long trail heritage The long-range battery is secure while you ride & easy to remove for charging in any household electrical socket