Powerfly FS
Origin
The Powerfly FS has been Trek's volume full-suspension e-MTB since 2018 and is the trail-capable, do-everything sibling to the more aggressive Rail. Built around an aluminum frame with 120 mm rear and 130 mm front travel (latest Gen 4), it pairs ABP rear suspension geometry borrowed from the analog Fuel EX with the Bosch Performance Line CX motor — 85 Nm of torque in Gen 4 trim, and up to 100 Nm with the optional Race firmware. The Removable Integrated Battery (RIB) system lets riders pull the 600 or 800 Wh PowerTube out without tools. For 2025 Trek launched the Powerfly+ FS Gen 4 on the new Bosch CX Gen 5 platform, signaling the platform will continue evolving. The FS sits below Rail in price and travel, making it the practical pick for riders who want one bike for trail, gravel double-track, and bikepacking.
Specifications
- Frame
- Alpha Platinum Aluminium, Removable Integrated Battery (RIB) downtube, ABP rear suspension
- Weight
- kg
- Drivetrain
- Shimano CUES LG300 LINKGLIDE 1×10, 11-48T (Gen 4); up to Shimano XT 1×12 on earlier/higher trims
- Brakes
- Tektro Gemini SL 4-piston hydraulic disc, 203 mm rotors (Gen 4); Tektro/Shimano 180 mm on earlier gens
- Wheels
- 29" (27.5" on XS/S sizes), Bontrager Line TLR 30 alloy rims, Boost hubs, tubeless ready
The verdict
- Bosch Performance Line CX motor — class-leading reliability, smooth power delivery, 85 Nm (up to 100 Nm via firmware)
- RIB tool-free removable battery makes charging and multi-day rides convenient; range-extender support pushes capacity over 1 kWh
- ABP rear suspension borrowed from analog Fuel EX gives composed, balanced trail manners
- Trek's mature platform — long production run, wide dealer/service network and parts availability
- Versatile do-it-all geometry: equally at home on trail, gravel double-track and bikepacking
- Heavy — ~24.6 kg in Gen 4 trim, noticeably more than carbon competitors and harder to handle when battery dies
- Aluminium-only frame; no carbon option, unlike the pricier Rail
- Base trims use budget components (SR Suntour fork, Tektro brakes, Shimano CUES) that ambitious riders may want to upgrade
- Less travel and a steeper head angle than the Rail — not the pick for aggressive enduro descending
- Motor noise and the smartphone/Purion display are common complaints in reviews; high price for an alloy build
Who it’s for
Related models
Want one?
Find this bike on the marketplace, or compare notes with riders already on one.