Trek's recommended rider height for this size (small):
height: 155 - 165 cm / 5'1" - 5'5"
inseam: 74 - 78 cm / 29" - 31"
## Condition
Very good. Well maintained, normal light cosmetic wear from riding. Mechanically sound — everything works as it should. Battery holds charge.
## Key Specs
- **Motor:** Bosch Performance Line CX (250W, 85 Nm of torque) — assists up to 20 mph
- **Battery:** Bosch PowerTube 500Wh (integrated, removable with no tools via Trek's RIB system)
- **Suspension:** 120mm front fork / 100mm rear travel with Active Braking Pivot
- **Drivetrain:** 10-speed Shimano Deore
- **Brakes:** Shimano hydraulic disc
- **Dropper Post:** Included
- **Frame:** Lightweight Alpha Platinum Aluminum
The Powerfly FS 4 is Trek's entry into serious full-suspension eMTB territory. The Bosch CX motor handles steep climbs effortlessly, and the full suspension makes rough trails comfortable and fun. The 27.5" wheels are nimble and playful on tight singletrack. Whether you're commuting, exploring fire roads, or hitting proper trails, this bike does it all.