ELECTRIC MOUNTAIN BIKE TREK POWERFLY FS+ 4 29 Mercury/Dark Web

The TREK Powerfly FS+ 4 Gen 4 is an electric mountain bike with 130 mm of front travel and a powerful drive system, designed for mountain adventures and trail riding.

Who is the TREK Powerfly FS+ 4 Gen 4 ideal for?

It sits in the mid-range of full-suspension electric mountain bikes. With 130 mm of front travel and 120 mm of rear travel, it is a classic trail bike, offering an excellent balance between climbing ability and stability on descents. It is designed for recreational and advanced riders tackling all-day rides and moderately technical descents.

Key benefits of the TREK Powerfly FS+ 4 Gen 4

• Bosch Performance Line CX motor: The compact unit delivers 85 Nm of torque for smooth progress on steep climbs, with the option to upgrade to 100 Nm via the eBike Flow app.
• Bosch PowerTube 600 Wh battery: The RIB 2.0 system makes the battery easy to remove for charging and provides enough range for long mountain rides.
• RockShox suspension: The combination of a Recon Silver RL fork and Deluxe Select R rear shock smooths out bumps on demanding trails.
• Shimano CUES drivetrain: The 10-speed drivetrain with LINKGLIDE technology offers exceptional durability and smooth shifting under load.
• Tektro Gemini SL brakes: 4-piston hydraulic callipers with 203 mm rotors ensure consistent stopping on long, steep descents.

Out on the trail

On technical climbs, the Bosch Performance Line CX motor with 85 Nm of torque and grippy Bontrager Gunnison Pro XR tyres provide smooth power over roots and rocky steps.

On all-day rides, the 600 Wh battery and considered geometry help reduce fatigue, while the Active Braking Pivot system keeps the suspension active even while braking.

On fast descents, 130 mm of front travel and Tektro 4-piston brakes provide stability and a controlled feel over rocky sections and forest trails.

Frequently asked questions