TREK POWERFLY FS+ 8 GEN 4 800Wh eMTB BIKE 2025 MATTE/GLOSS MULSANNE BLUE

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

 Its sturdy aluminium frame partners with just enough travel to smooth out rough trails, with 130 mm front and 120 mm rear suspension. It comes equipped to go anywhere with a powerful Bosch Performance Line CX motor and a huge 800 Wh Removable Integrated Battery 2.0 (RIB 2.0), so you never have to limit your exploring.

Key Features Trek Powerfly+ 8 Gen 4 e-MTB Bike 2025

• RIB 2.0 removable integrated battery: Easy to remove for travel and storage, and it's virtually rattle-free while you ride.
• Bosch Performance Line CX motor: Delivers plenty of torque for steep, punchy climbs and is easy to control with the Purion 200 remote – plus you can customise it in the eBike Flow app.
• SRAM AXS T-Type transmission: Clean, wireless shifts from a 12-speed wireless SRAM GX Eagle AXS T-Type transmission

Full Specification

• Frame: Alpha Platinum, Removable Integrated Battery (RIB 2.0), tapered headtube, internal routing, Motor Armour, rack and mudguard mounts, ABP, Boost 148, 120 mm travel
• Fork: Fox Rhythm 36, Float EVOL air spring, GRIP damper, tapered steerer, 44 mm offset, Boost110, 15 mm Kabolt axle, 130mm travel
• Rear Shock: Fox Float Rhythm, 2-position damper, 210x50 mm
• Motor: Bosch Performance Line CX, 20 mph (25 km/h in Europe)
• Battery: Bosch PowerTube 800Wh, smart system
• Controller: Size: S , M , L , XL - Bosch Kiox 300, smart system
  Size: S , M , L , XL - Bosch LED remote, smart system
• Gear Shifters: SRAM AXS POD
• Chainset:SRAM GX, 160 mm length
• Rear Cassette: SRAM Eagle XS-1275, T-Type,10-52, 12-speed
• Chain: SRAM GX Eagle, T-Type, 12-speed
• Front Derailleur: N/A
• Rear Derailleur: SRAM GX Eagle AXS, T-Type
• Bottom Bracket:.
• Pedals: VP-536 nylon platform
• Front Wheel: Size: S - Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 27.5"
  Size: M , L , XL - Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 29"
• Rear Wheel: Size: S - Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12mm thru axle, 27.5''
  Size: M , L , XL - Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12mm thru axle, 29''
• Tyres: Size: S - Bontrager Gunnison Pro XR, Tubeless-Ready, wire bead, 60 tpi, 27.5x2.40"
  Size: M , L , XL - Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40"
• Brakes: SRAM DB 8 4-piston hydraulic disc
• Handlebars: Bontrager Comp, alloy, 31.8 mm, 40mm rise, 780 mm width
• Handlebar Grip: Bontrager XR Trail Comp, nylon lock-on
• Headset: FSA IS-2, 1-1/8" top, 1.5" bottom
• Stem: Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 50 mm length
• Saddle: Bontrager Verse P3, steel rails
• Seatpost: Size: S - Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 31.6 mm, 310 mm length
  Size: M , L , XL - Bontrager Line Dropper, 170 mm travel, MaxFlow, internal routing, 31.6 mm, 450 mm length
• Accessories: N/A
• Weight: This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.

Bike and frame weights are based on pre-production painted frames at time of publication. Weights may vary in final production.

At All Terrain Cycles, we want you to ride with confidence every time. To ensure your bike or e-bike stays in peak condition, here are some essential safety and maintenance tips.

Bicycle Safety 

Always wear a helmet – Safeguard against head injuries by using a properly fitted, safety-certified helmet.

Perform pre-ride checks – Before each ride, verify that brakes, tyres, and gears are in good working order.

Stay visible – Utilise lights and reflective gear when cycling in low-light conditions.

Follow road rules – Ride responsibly and remain aware of your surroundings.

Aftercare for Your New Bike Initial Check-Up (First 50-100 miles)

Gear Adjustment – New cables may stretch slightly; have a qualified mechanic check and adjust them.

Brake & Wheel Check – Inspect brakes for wear and ensure wheels are aligned properly.

Lubrication – Apply chain oil and check bolt tightness to maintain smooth performance.

Tyre Pressure – Regularly monitor to prevent flats and enhance efficiency.

Pedals - Ensure pedals are still tight and correctly fitted.

Routine Maintenance (Every Few Weeks)

Chain Care – Clean and lubricate your chain to minimise wear and prolong its life.

Brake Safety – Check brake pads and responsiveness before each ride.

Tyre Inspection – Look for punctures and ensure correct air pressure.

Handlebar & Stem Alignment – Confirm they are tight and secure to prevent instability.

Frame Safety Check – Look for any signs of damage or cracks.

Pedals - Ensure pedals are still tight and correctly fitted.

Professional Check-Ups

Have your bike serviced at least once a year, or more frequently if you ride often.

Aftercare for Your New Electric Bicycle (e-Bike) Initial Check-Up (First 50-100 miles)

Battery Care – Fully charge your battery (if required) before the first ride and store it in a dry, moderate-temperature environment.

Avoid Overcharging – Unplug the charger once fully charged to extend battery life.

Pedals - Ensure pedals are still tight and correctly fitted.

Routine e-Bike Maintenance (Every Few Weeks)

Motor Inspection – Listen for unusual noises and ensure smooth operation.

Battery & Connection Checks – Inspect cables and connectors for dirt, moisture, or damage.

Pedals - Ensure pedals are still tight and correctly fitted.

Seasonal e-Bike Maintenance

Check Electrical Components – Ensure wires and connections are clean and secure.

Professional Servicing – Have your e-bike inspected at least once a year or every 500-1000 miles for optimal performance.

By following these aftercare guidelines, you’ll help ensure that your bicycle runs smoothly, lasts longer, and remains a joy to ride. Stay safe and enjoy the ride!

Read our full advice

If you have any problems or concerns: Contact All Terrain Customer Services on 01274 588488 or email sales@allterraincycles.co.uk