Trek Powerfly FS+ 8 Gen 4 Electric Mountain Bike - Blue - Trek - 5329743

The Powerfly FS+ 8 is a deluxe full-power, full suspension electric mountain bike ready for advent...

Best current price£5,250.00from Team Cycles

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Team CyclesTrek Unisex Red Powerfly Fs+ 8 Gen 4 800Wh Full Suspension Electric Mountain Bike Gloss Lava And Matte Dark Web
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£5,250.00
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Evans Cycles UKTrek Powerfly Fs+ 8 Gen 4 2026 Electric Mountain Bike Medium Blue
£4.99 delivery
£5,399.00
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Product Information

Full details

The Trek Powerfly FS+ 8 Gen 4 is designed for adventurous trail riders seeking a capable and comfortable electric mountain bike. Its full suspension and powerful Bosch motor provide confidence on challenging terrain, while the wireless SRAM drivetrain ensures smooth gear changes. A potential caveat for some users might be the specific assist speed limit, which varies by region.

All features

Model Part Number5329743
BrandTrek

Extended Product Information

FAQs

What is the maximum assist speed for the Powerfly FS+ 8 Gen 4?

The maximum assist speed is 20 mph (32 km/h) in North America, and 25 km/h in EU and APAC regions, depending on local regulations.

How long does the 800 Wh battery typically last?

Battery life varies significantly based on terrain, rider weight, assist level, and pedaling effort. However, the 800 Wh capacity is designed to offer extended range, often suitable for rides between 40-100 miles (65-160 km).

Can I fit different tires to this bike?

Yes, the bike is designed for 29x2.40 inch tires and is Tubeless Ready. You can fit other compatible 29er tires, but ensure they have sufficient clearance within the frame and fork.

What maintenance does the wireless SRAM AXS system require?

The primary maintenance is ensuring the shifter and derailleur batteries are charged. Regular cleaning of the components and checking for proper alignment is also recommended. SRAM provides specific guides for system setup and maintenance.

How do I adjust the bike's geometry?

The bike features a Mino Link system, typically a small chip on the rocker arm of the suspension. By flipping this chip, you can adjust the head angle and bottom bracket height to alter the bike's handling characteristics.

What is the travel of the front and rear suspension?

The Fox Rhythm 36 fork provides 130 mm of travel, and the Fox Float Rhythm rear shock offers 120 mm of travel.

Is this bike suitable for bike parks or shuttle runs?

While the bike has capable full suspension and strong brakes, it is primarily designed for trail riding and climbing with assistance. For demanding bike park use with frequent chairlift or shuttle access, a longer-travel enduro or downhill-specific e-bike might be more appropriate.

Troubleshooting

Bike not powering on

Ensure the battery is fully charged and correctly inserted. Check that the battery connection is clean. Verify the Bosch LED remote is paired and functioning.

Error code on Bosch LED remote

Consult the Bosch eBike Smart System manual for a specific error code explanation and troubleshooting steps. Common solutions include restarting the system or checking connections.

Wireless shifting not working correctly

Check battery levels for the shifter. Re-pair the derailleur with the shifter following SRAM AXS instructions. Ensure the derailleur is properly aligned.

Brakes are squeaking or feel weak

Clean the brake rotors and pads with isopropyl alcohol. Check brake pad wear and replace if necessary. Ensure the brake system is properly bled if performance is significantly reduced.

Suspension feels harsh or is bottoming out

Check tire pressure and suspension air pressure settings against recommended values for your weight. Adjust rebound and compression settings on the fork and shock as needed. Consult the Fox suspension manuals for detailed tuning guides.

Pros and Cons

Pros

  • Full suspension provides excellent comfort and control on rough terrain.
  • Powerful Bosch motor offers strong assistance for climbs and long rides.
  • Wireless electronic shifting is precise and reliable.
  • Large 800 Wh battery offers extended range.
  • High-quality components like Fox suspension and SRAM brakes ensure performance.

Cons

  • The maximum assist speed may be limited to 25 km/h in certain regions.
  • Full suspension adds weight compared to hardtail e-MTBs.
  • Wireless electronic components may require specialized maintenance.
  • The 160 mm crank length might not be ideal for all riders or terrains.

Setup, Compatibility & Care

Initial Setup: Upon receiving the bike, ensure the wheels are securely fastened and the tires are inflated to the recommended pressure. Familiarize yourself with the Bosch LED remote and system functions. It is highly recommended to have a professional bike shop complete the final assembly and safety checks, especially for the brakes and suspension.

Compatibility: This bike uses standard Boost 148 spacing. The drivetrain is T-Type compatible. The frame features UDH (Universal Derailleur Hanger) compatibility. It accepts 31.6 mm seatposts, and the included dropper post is 170 mm. The frame has mounts for racks and mudguards, though clearance may be limited with wider tires.

Care: Regularly clean the bike after rides, especially the drivetrain and suspension linkages, using mild soap and water. Avoid high-pressure washers. Keep the chain lubricated. Periodically check brake pad wear and rotor condition. For the e-system, ensure the battery is stored in a moderate temperature environment when not in use and charged according to Bosch guidelines. Refer to the Bosch manual for specific e-bike system care instructions. Inspect suspension seals for damage and clean them regularly.

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