Powerfly FS 4 is the gateway to more exciting trail adventures. It's a full-suspension electric mountain bike that pairs the capability of a 130 mm trail bike with the power of a Bosch motor. A 10-speed drivetrain and a strong aluminium frame with Trek's easy-to-use Removable Integrated Battery (RIB) help you take on more rugged trails with comfort and confidence.
It's right for you if...
You like singletrack trails and want an e-MTB with a more capable full suspension set-up so you can take on more rugged adventures and stay comfortable and efficient when you do.
The tech you get
A durable Alpha Aluminium frame that fully encases a long-life 500 Wh battery, a powerful Bosch Performance CX 250w drive system that helps you sustain speeds of up to 25 km/h and an ergonomic Purion controller. Plus, a SR Suntour XCR 34 130mm suspension fork with an adjustable air spring, a 130 mm RockShox Deluxe RL shock, a 10-speed Shimano drivetrain and hydraulic disc brakes.
The final word
Full suspension lets you take on bigger, more technical trails. It's more comfortable, more efficient and faster in rough terrain. You're getting great parts and 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.
Why you'll love it
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
Trek's Removable Integrated Battery (RIB) system looks great and is super user-friendly: it fully hides the battery in the frame for protection, makes it easy to remove the battery without tools and lets you mount a water bottle cage – even on full suspension e-MTBs
It's equipped with an external charging port for easy charging on or off the bike
It rides like a mountain bike because it is one: it has the same frame and suspension tech that we've refined in our decades-long trail heritage
The Purion controller has Walk Assist and an intelligent eMTB mode that automatically delivers the right amount of power based on your terrain
Specifications
Frameset
Frame
Alpha Platinum Aluminum, Removable Integrated Battery (RIB), tapered head tube, Knock Block, Control Freak internal routing, Motor Armor, magnesium rocker link, Mino Link, ABP, Boost148, 130mm travel
Fork
SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 44mm offset, Boost110, 15mm bolt-on thru axle, 130mm travel
Rear suspension
RockShox Deluxe RL, 205x50mm
Wheels
Front hub
Formula DC-511, 6-bolt, Boost110, 15mm thru axle
Rear hub
Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12mm thru axle
Rims
Bontrager Connection, double-wall, 32-hole, 20mm width, presta valve
Tyres
Bontrager XR3 Comp, wire bead, 30 tpi, 27.5x2.35"
Drivetrain
Shifters
Shimano Deore M6000, 10 speed
Rear derailleur
Shimano Deore M6000, mid cage, 42T max cog
Crank
FSA 310, 15T w/chain guard
Cassette
SunRace, 11-42, 10 speed
Chain
KMC X10, 10 speed
Pedals
VP-536 nylon platform
Components
Saddle
Bontrager Arvada, steel rails
Seatpost
Bontrager alloy, 31.6mm, 12mm offset
Handlebar
Bontrager alloy, 31.8mm, 15mm rise
Grips
Bontrager XR Trail Comp, nylon lock-on
Stem
Bontrager Rhythm Comp, 31.8mm, Knock Block, 0 degree
Head set
Knock Block Integrated, cartridge bearing, 1-1/8" top, 1.5" bottom
Brake set
Tektro HD-M275 hydraulic disc
Accessories
Battery
Bosch PowerTube, vertical, 500wh
Controller
Bosch Purion
Motor
Bosch Performance CX, 250Watt, 75Nm, 25km/h max assist
Weight
Weight limit
This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.
Bike and frame weights are based on Trek pre-production painted frames at the time of publication. Weights may vary in final production
Buy Trek Powerfly FS 4 G2 EU 2020 Electric Bike online and collect from our Gorleston Norwich or Kings Lynn bike shop