Trek Powerfly+ FS 4
Trek's trail full-suspension e-MTB with a Bosch Performance Line CX motor, a 600Wh battery, a RockShox Recon fork with 130 mm and 120 mm of rear travel.
Make It Yours
Colour Options
Check availability →
Every Build
Builds and Prices
See them at Trek →| Build | Price | Online stock |
|---|---|---|
| Powerfly+ FS 4 Gen 4 | $4,499.99 | Out of stock online |
Prices and stock read from Trek's US store on October 25, 2026. Closeout means Trek has marked the build for clearance, so the price ends when the stock does.
Watch the Review
Video Review
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Studio Photos
Up Close
Detail Gallery
The Engineering
What Trek Says About the Powerfly+ FS 4
Power
Straight from Trek's spec sheet.
Bosch Performance Line CX
Trek lists the CX motor with up to 120 Nm of torque.
Removable integrated battery
Trek's RIB 2.0 frame holds a 600Wh Bosch PowerTube.
Suspension
Straight from Trek's spec sheet.
RockShox Recon fork
130 mm Solo Air fork with fender mounts.
Full-suspension frame
Alpha Platinum Aluminum with Motor Armor to shield the drive unit.
Trail Parts
Straight from Trek's spec sheet.
Dropper post
Bontrager Line Dropper with 100 mm of travel.
Tubeless-ready tires
Bontrager Gunnison Pro XR 27.5 x 2.40.
Plan Your Ride
Your Range, Not Trek's
Trek does not state a range for the Powerfly+ FS 4 in the spec data we pulled, so there is no claimed figure to compare. Set it up the way you actually ride and the calculator gives you a window to plan inside. It uses the battery size on this page and an assumed bike weight of 52 lb, because Trek's data does not list one.
Find Your Fit
Sizes
Frame sizes Trek lists for the Powerfly+ FS 4
- S (27.5" wheel)Listed by Trek
- M (29" wheel)Listed by Trek
- L (29" wheel)Listed by Trek
- XL (29" wheel)Listed by Trek
Rider-height ranges are on Trek's sizing and fit guide. Not every size is in every colour or build.
The Numbers
Full Specifications
Source: trekbikes.com →⚡ E-System
🚦 Class and Speed
🔧 Frame and Components
✨ Practical Extras
All specs are Trek's, read from Trek's US product data on October 25, 2026. Builds inside a family differ, so the build is named wherever it matters.
The Bike Cave Verdict
Not Yet Tested by Ben
Ben has not ridden the Trek Powerfly+ FS 4, so there is no verdict, no Cave Score and no measured number here. What follows is Trek's own spec sheet, checked against Trek's US store on October 25, 2026. If he rides one, this is where his words go.
What the spec sheet lists
- Bosch Performance Line CX motor
- 600Wh removable integrated battery
- Full suspension with a RockShox fork
- Dropper seatpost fitted
- Fender mounts on the frame and fork
What to know before you buy
- Ben has not ridden it, so no trail, climbing or range verdict
- No stock online in any size or colour
- Only one build, with no upgrade option
- Single build, so no step up or step down inside the family
Frequently asked questions
How much is the Trek Powerfly+ FS 4?
$4,499.99 on Trek's US store on October 25, 2026. It shows no stock in any size or colour.
What motor does the Trek Powerfly+ FS 4 have?
A Bosch Smart System Performance Line CX motor, rated up to 120 Nm, with a 600Wh PowerTube battery.
Is the Powerfly+ hardtail still sold?
Not on Trek's US store on the date we checked. The Powerfly+ FS 4 is the only Powerfly+ listed.
What class is the Trek Powerfly+ FS 4?
Class 1, pedal assist up to 20 mph, no throttle.
Has Ben tested the Trek Powerfly+ FS 4?
No. Ben has not ridden the Trek Powerfly+ FS 4 yet, so this page has no Cave Score, no verdict and no measured numbers. Everything here is Trek's claimed spec, checked against Trek's US store on October 25, 2026.
Where can I buy the Trek Powerfly+ FS 4?
On Trek's US store or from a Trek retailer. The buttons on this page open Trek's store through our affiliate link; search for the Powerfly+ FS 4 there. Stock and prices move, so confirm both at checkout.
Is the Trek Powerfly+ FS 4 UL certified?
Trek's US product pages do not state a UL listing in the spec data we pulled, so we are not claiming one. Ask Trek or a Trek retailer for the certification of the specific build before you buy.
Affiliate disclosure: the Trek buy links on this page are affiliate links. If you buy, Trek pays The Bike Cave a commission and you pay the same price. How that works.