TREK POWERFLY FS+ 4 800Wh GEN 4 eMTB BIKE 2026 MERCURY/DARK WEB

eBikes by their very nature can in the future require aftermarket updates and support. This cannot be supplied by All Terrain Cycles at distance; if required the work would have to be obtained from your local Brand Dealership, possibly at extra cost to yourself.

Your eBike will be delivered built, set up and updated.

Minimum personal assembly is required.

The Powerfly FS+ 4 800W is a full-power full suspension electric mountain bike for taking on alpine adventures.

Its powerful Bosch motor gives you a boost for soaring up climbs, while a massive 800 Wh battery keeps you going through your longest adventures. A RockShox suspension package (120 mm rear, 130 mm front) smooths out rough trails.

Please note: spec in the product illustration may not be accurate

Key Features 

• 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.
• 10-speed Shimano CUES drivetrain: Delivers clean-shifts for any kind of trail.

Full Specification

• Frame: Alpha Platinum Aluminium, Removable Integrated Battery (RIB 2.0), tapered headtube, guided internal routing, Motor Armor, angle-adjust headset, Mino Link adjustable geometry, adjustable leverage rate, 34.9 mm seat tube, ABP, UDH, rack and mudguard mounts, Boost 148, 120 mm travel
• Fork: RockShox Recon Silver, Solo Air spring, Motion Control damper, lockout, tapered steerer, 42mm offset, Boost110, Maxle Stealth, mudguard mounts, 130mm travel
• Shock: RockShox Deluxe Select R, 210x50 mm
• Motor: Bosch Performance Line CX
• Battery: Bosch PowerTube 800Wh, smart system
• Controller: Bosch Purion 200
• Shifters: Shimano U6000, 10 speed
• Chainset: FSA Bosch CK-220, 36T ring, 165mm
• Cassette: Shimano CUES LG300, LINKGLIDE, 11-48, 10 speed
• Chain: Shimano LG500, 9/10/11 speed
• Front Derailleur: N/A
• Rear Derailleur: Shimano CUES U6000 GS
• Bottom Bracket: Sealed Bearing
• Pedals: VP-536 nylon platform
• Rims: Bontrager Line TLR 30
• Front Hub: Shimano TC500 alloy, centrelock, 110x15mm thru axle
• Rear Hub: Shimano TC500 alloy, centrelock, 148x12mm thru axle
• Tyres: Bontrager Gunnison Pro XR, Tubeless Ready 29x2.4 (S-27.5)
• Brakes: Tektro Gemini SL 4 piston hydraulic brake
• Handlebars: Bontrager Comp, alloy, 31.8mm, 40mm rise, 780mm width
• Handlebar Grip: Bontrager XR Trail Comp / Trek Line Comp
• Headset: FSA IS-2, 1-1/8" top, 1.5" bottom
• Stem: Bontrager Comp, 31.8mm, Blendr compatible, 7 degree 50mm length
• Saddle: Bontrager Verse P3, Steel Rails
• Seatpost: Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 31.6 mm, 310 mm length S-310mm, M-XL 450mm
• Weight: This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).
  
• SKU: 57351

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.

We offer several delivery options:

Store Collection: Pick up your order at our Salts Mill store, located at BD17 7EH.

Standard Delivery We partner with APC Euro-Tran for deliveries. Once your bike is dispatched, it typically arrives within 1 to 3 working days for Mainland UK. All bikes are fully built, checked, set up and then packed back down into a standard size bike box. Please note that electric bikes will be shipped in two boxes due to weight and size restrictions. We recommend our premium delivery service for electric bikes.

Premium Delivery We partner with DX's two-person delivery team. After dispatch, your bike usually arrives within 2 to 4 working days for Mainland UK. DX will contact you before delivery to schedule a convenient delivery date. All bikes come fully built, checked, set up and with both wheels attached. Trek bikes can only be sent via our premium delivery service.

Check out our video for more information on how your bike is assembled and packaged. 

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