Trek Powerfly+ FS 4 Gen 4
Trek / Electric Mountain Bikes
Electric help for every trail.
Powerfly+ FS 4 is a full-power full-suspension electric mountain bike built for alpine adventures and rough trails. Its Alpha Platinum Aluminum frame pairs with a 130mm RockShox Recon Silver fork and RockShox Deluxe Select rear shock to smooth out rugged terrain, while a Bosch Performance Line CX motor and 600Wh battery give you the power to explore farther. A 10-speed Shimano CUES drivetrain keeps shifting simple and low-maintenance, and Tektro HD-M5140 4-piston hydraulic disc brakes deliver confident stopping power.
Based on the bike's size chart. Your complimentary baseline fit in store dials in the rest.
In stock today at Roswell
Questions are welcome. No pressure, no bike jargon required.
The ride, not just the specs
Powerfly is an electric mountain bike that makes trails more approachable and rides more fun. The motor smooths out the climbs, so you can ride farther and explore more.
It's a great way to get into trail riding or to keep riding the trails you love.
What makes it special
Removable Integrated Battery (RIB 2.0) makes it easy to remove your battery for more convenient charging or traveling, and you don't have to worry about dropping it thanks to a secondary safety catch.
Wanna take your ride even farther? Pair a 250Wh PowerMore range extender with your bike to chase your most epic adventures.
Bosch's Performance Line CX motor has 85nm of torque out of the box but can be tuned all the way up to 100Nm and 750 watts of power using the Bosch eBike Flow app, the all new Bosch CX motor is lighter, quieter, and now more powerful than ever without wavering on natural-feeling support for crushing epic rides.
For the detail-oriented
Tap any group to see every part.
Measurements in cm unless noted.
| Size | S | M | L | XL |
|---|---|---|---|---|
| Rider height | 5'1"–5'5" | 5'5"–5'10" | 5'10"–6'2" | 6'2"–6'5" |
| Seat tube (A on the drawing) | 38.0 | 40.0 | 42.0 | 45.0 |
| Seat tube angle (B on the drawing) | 71.1° | 71.3° | 71.2° | 72.4° |
| Head tube length (C on the drawing) | 13.0 | 11.0 | 13.0 | 15.0 |
| Head tube angle (D on the drawing) | 65.0° | 66.0° | 66.0° | 66.0° |
| Eff. top tube (E on the drawing) | 56.3 | 59.5 | 63.0 | 65.4 |
| BB height (F on the drawing) | 33.0 | 33.5 | 33.5 | 33.5 |
| BB drop (G on the drawing) | 3.0 | 4.5 | 4.5 | 4.5 |
| Chainstay length (H on the drawing) | 45.8 | 46.1 | 46.1 | 46.1 |
| Offset (I on the drawing) | 4.4 | 4.4 | 4.4 | 4.4 |
| Trail (J on the drawing) | 12.3 | 12.5 | 12.5 | 12.5 |
| Wheelbase (K on the drawing) | 120.1 | 122.3 | 125.7 | 129.0 |
| Standover (L on the drawing) | 75.6 | 78.0 | 77.5 | 77.8 |
| Reach (M on the drawing) | 42.5 | 45.0 | 47.5 | 50.0 |
| Stack (N on the drawing) | 59.7 | 62.9 | 64.7 | 66.6 |
| Frame size | 15.5" | 17.5" | 19.5" | 21.5" |
| Wheel size | 27.5" | 29" | 29" | 29" |
| Eff. seat tube angle | 77.0° | 77.0° | 77.0° | 77.0° |
The Atlanta Cycling difference
Specs matter. But so does how a bike feels when you ride it. Our team is here to help you choose the right size, understand the details, and get comfortable before your first ride.
When you buy from Atlanta Cycling, you're not just getting a box with a bicycle in it. You're getting a 30-day money-back guarantee, a complimentary baseline fit, lifetime basic adjustments, and real people who want you to love every mile.
Four neighborhood stores. One shared passion.
Ansley. Alpharetta. Roswell. Vinings. Stop by, take a test ride, ask questions, and meet the people who will be here long after your first ride.
