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Trek Powerfly FS Plus 4 specifications and in-depth review

Trek Powerfly FS Plus 4

Manufacturer: Trek

The Trek Powerfly FS Plus 4 is a full-suspension electric mountain bike built around an aluminum frame, designed for riders who want capable off-road performance with the assistance of a pedal-assist drivetrain. It features both front and rear suspension, making it suited for varied terrain, and carries its battery integrated within the frame for a cleaner profile and better weight distribution. The bike is aimed at adult riders and uses internal cable routing for a tidy finish.

Powering the Powerfly FS Plus 4 is a 250W mid-drive motor delivering up to 85 Nm of torque, paired with a 600 Wh removable battery that supports a maximum range of 115 km per charge and takes approximately 6 hours to fully recharge. The drivetrain offers 10 gears alongside multiple assist modes including eco and turbo, while a cadence and torque sensor combination governs pedal assistance. Stopping is handled by hydraulic disc brakes, and the bike includes a handlebar display, a dedicated smartphone app, integrated front and rear lighting, and support for regenerative braking. Top assisted speed is rated at 32 km/h.

Pros
  • Both front and rear suspension provide capability for varied and uneven terrain
  • The removable 600 Wh battery allows for off-bike charging, adding flexibility to the recharging routine
  • Regenerative braking recovers energy during deceleration, contributing to the 115 km maximum range
  • A combined cadence and torque sensor enables more responsive and nuanced pedal assistance
  • Hydraulic disc brakes deliver consistent stopping power across the full speed range
  • Integrated front and rear lights are built in, removing the need for separate lighting accessories
Cons
  • At 24,580 g, the overall weight is substantial, which can make handling or transporting the bike more demanding
  • The bike cannot be folded, limiting portability and storage options in confined spaces
  • No anti-theft features are included, requiring the owner to rely entirely on external security solutions
  • A 6-hour full charge time is relatively long, which may be inconvenient when access to charging is limited
Who is this for?

This bike is well-suited to adult riders who regularly tackle mixed or off-road terrain, given its full front and rear suspension setup and mid-drive motor with 85 Nm of torque. The 115 km maximum range and removable 600 Wh battery make it a practical choice for longer trail rides or multi-stop commutes where recharging on the go is a consideration. Riders who value an integrated, tidy build will also appreciate the internal cable routing, in-frame battery placement, and built-in lighting.

Who is this NOT for?

At nearly 24,600 g and without a folding mechanism, this bike is poorly suited to riders who need a lightweight or easily portable option — such as those commuting via public transport or storing the bike in tight urban spaces. The 6-hour charge time and absence of any anti-theft features make it less practical for riders who frequently leave the bike unattended in public or need rapid turnaround between rides. It is also not appropriate for children, as it is designed exclusively for adult use.

Design:

frame material Aluminum
weight 24580 g
has front suspension ✓
has rear suspension ✓
has an in-frame battery ✓
can be folded ✕
has internal cable routing ✓
is designed for kids ✕

The Trek Powerfly FS Plus 4 is built around an aluminum frame and tips the scales at 24,580 g, reflecting its full-suspension construction with both front and rear suspension in place. The battery sits integrated within the frame rather than mounted externally, and cable routing runs internally throughout for a cleaner overall appearance. The bike is not designed for children, cannot be folded for transport, and is intended for use as a full-sized adult bicycle.

Battery:

battery size 600 Wh
charge time 6 hours
Has regenerative braking ✓
has a removable battery ✓

The bike is equipped with a 600 Wh removable battery that can be taken off the frame for convenient charging, reaching a full charge in approximately 6 hours. It also supports regenerative braking, which feeds energy back into the battery during braking to help extend overall range.

Performance:

maximum distance per charge 115 km
braking system Hydraulic disc brakes
maximum torque 85 Nm
has a turbo mode ✓
has an eco mode ✓
motor power 250W
is a multi-gear bike ✓
number of gears 10
is a single-gear bike ✕
drive motor type Mid-drive motor
top speed 32 km/h

At the heart of the drivetrain sits a 250W mid-drive motor producing up to 85 Nm of torque, with a top assisted speed of 32 km/h and a maximum range of 115 km on a single charge. The motor offers both eco and turbo assist modes to suit varying riding demands, and the bike runs a 10-speed multi-gear setup rather than a single fixed gear. Braking is handled by hydraulic disc brakes, providing consistent stopping performance across the available speed range.

Features:

pedal sensor type Cadence sensor & torque sensor
has anti-theft features ✕
Has a display ✓
Has a dedicated smartphone app ✓
has front light(s) ✓
has rear light(s) ✓

Pedal assistance is managed through a combined cadence and torque sensor, allowing the motor to respond to both pedaling speed and rider input force. The bike includes an on-board display and pairs with a dedicated smartphone app for additional control and data access. Integrated front and rear lights are fitted as standard, while no anti-theft features are included.

Final Verdict

The Trek Powerfly FS Plus 4 is a well-equipped full-suspension electric mountain bike that brings together a capable mid-drive motor, a generous 600 Wh removable battery, and a thoughtfully integrated build — making it a solid option for adult riders who prioritize trail performance and longer-range riding over portability. Its dual-suspension aluminum frame combined with hydraulic disc brakes and a 10-speed drivetrain gives it a well-rounded technical foundation for demanding riding conditions. That said, its considerable weight and non-folding design mean it asks for a degree of commitment in terms of transport and storage. For riders whose primary concern is off-road capability and ride comfort over extended distances, the Powerfly FS Plus 4 delivers a coherent and feature-complete package.