Powerfly FS 4 500 Gen 2
Trek
Crosscountry
Powerfly FS 4 500 Gen 2 is an alloy electric cross-country mountain bike (2023), by Trek, from the Powerfly lineup. It is best suited to a wide range of riders thanks to its fit flexibility, with a balanced riding position, while being best for smoother trails and efficient rolling. The main strengths in the metrics are good fit flexibility for dialing in rider position, a comfort-leaning ride feel over longer rides, and strong speed potential on smoother terrain. Compared with more specialized alternatives, the compromise is a value score that depends more on priorities than pure price efficiency and battery range that is better for shorter daily use than long all-day outings. Compare this bike across categories on MatchBikes.com to see whether a nearby segment gives you a better fit.
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 | 1.45 mm | 1.49 mm | 1.41 mm | 1.34 mm |
| Bottom Bracket Height | 332 mm | 335 mm | 335 mm | 335 mm |
| Front Center | 713 mm | 739 mm | 773 mm | 798 mm |
| Rake | 44 mm | 44 mm | 44 mm | 44 mm |
| Trail | 107 mm | 114 mm | 114 mm | 114 mm |
| Stack | 594 mm | 632 mm | 641 mm | 641 mm |
| Reach | 410 mm | 425 mm | 455 mm | 480 mm |
| Top Tube Length | 559 mm | 584 mm | 616 mm | 641 mm |
| Seat Tube Angle | 76 ° | 76 ° | 76 ° | 76 ° |
| Seat Tube Length | 395 mm | 420 mm | 450 mm | 500 mm |
| Head Tube Angle | 66.5 ° | 66.5 ° | 66.5 ° | 66.5 ° |
| Head Tube Length | 140 mm | 130 mm | 140 mm | 140 mm |
| Chainstay Length | 463 mm | 465 mm | 465 mm | 465 mm |
| Wheelbase | 1175 mm | 1201 mm | 1235 mm | 1260 mm |
| Bottom Bracket Drop | 24 mm | 39 mm | 39 mm | 39 mm |
| Standover Height | 686 mm | 707 mm | 711 mm | 708 mm |
| Wheels | 27" | 29" | 29" | 29" |
| Rider Min Height | 153 cm | 170 cm | 176 cm | 186 cm |
| Rider Max Height | 167 cm | 184 cm | 189 cm | 196 cm |




























































