Powerfly FS+ 4 Equipped Gen 4
Trek
Trail
Powerfly FS+ 4 Equipped Gen 4 is an electric trail mountain bike (2025), by Trek, from the Powerfly lineup. This bike is aimed at a wide range of riders thanks to its fit flexibility, leaning toward a balanced riding position, and is well suited to natural trails and mixed off-road terrain. Based on the metrics, key strengths are good fit flexibility for dialing in rider position, strong speed potential on smoother terrain, and capable suspension support for rougher terrain. Relative to category specialists, the trade-off is a firmer ride feel than comfort-first options and a value score that depends more on priorities than pure price efficiency. Use MatchBikes.com to compare this bike with nearby trail options.
Rating

Score Summary
Performance
Built for speed and efficiency
Fit
Dialed-in Fit & Comfort
Value
Battery
Specifications
General
Frame
Drivetrain
Wheels
Brakes
Cockpit
Seat
E-Bike Components
Geometry
| Measurement | 15.5" | 17.5" | 19.5" | 21.5" |
|---|---|---|---|---|
| Stack Reach Ratio | 1.405 mm | 1.398 mm | 1.362 mm | 1.332 mm |
| Bottom Bracket Height | 330 mm | 335 mm | 335 mm | 335 mm |
| Front Center | 745 mm | 766 mm | 799 mm | 832 mm |
| Rake | 49 mm | 50 mm | 50 mm | 50 mm |
| Trail | 123 mm | 125 mm | 125 mm | 125 mm |
| Stack | 597 mm | 629 mm | 647 mm | 666 mm |
| Reach | 425 mm | 450 mm | 475 mm | 500 mm |
| Top Tube Length | 563 mm | 595 mm | 630 mm | 654 mm |
| Seat Tube Angle | 77 ° | 77 ° | 77 ° | 77 ° |
| Seat Tube Length | 380 mm | 400 mm | 420 mm | 450 mm |
| Head Tube Angle | 65 ° | 66 ° | 66 ° | 66 ° |
| Head Tube Length | 130 mm | 110 mm | 130 mm | 150 mm |
| Chainstay Length | 458 mm | 461 mm | 461 mm | 461 mm |
| Wheelbase | 1201 mm | 1223 mm | 1257 mm | 1290 mm |
| Bottom Bracket Drop | 30 mm | 45 mm | 45 mm | 45 mm |
| Standover Height | 756 mm | 780 mm | 775 mm | 778 mm |
| Wheels | 27" | 29" | 29" | 29" |
| Rider Min Height | 155 cm | 164 cm | 175 cm | 187 cm |
| Rider Max Height | 166 cm | 178 cm | 189 cm | 195 cm |




























































