TREK POWERFLY FS+ 4 GEN 4 eMTB BIKE 2025 PENNYFLAKE/BLACK OLIVE

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

It features 130 mm of front and 120 mm of rear trail-smoothing travel and a powerful Bosch Performance Line CX motor with a PowerMore compatible Removable Integrated Battery 2.0 (RIB 2.0) for getting far, far out there.

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

• Bosch Performance Line CX motor: Delivers plenty of torque for steep, punchy climbs and is easy to control with the Purion 200 remote
• Bontrager Line Dropper Post: Lets you lower your saddle on the fly so it's out of the way on descents.
• Shimano CUES 10-Speed Drivetrain: Simplicity combined with a wide gear ratio.

Full Specifications:

• 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: RockShox Recon Silver RL, Solo Air, Motion Control damper, lockout, tapered steerer, 42 mm offset, Boost110, 15 mm Maxle Stealth, 130 mm travel
• Rear Shock:
• Motor: Bosch Performance CX, smart system, magnesium motor body, 85 Nm, 15 mph max assist
• Battery: Bosch PowerTube 600 Wh, smart system
• Controller: Bosch Purion 200 Remote
• Charger: Bosch standard 2A, 230V, smart system
• Gear Shifters: Shimano U6000, 10-speed
• Chainset: FSA Bosch CK-220, 36T ring, 165 mm length
• Rear 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
• Pedals: VP-536 nylon platform
• Front Hub: Bontrager sealed bearing, alloy axle, 6-bolt, Boost110, 15 mm thru axle
• Rear Hub: Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12 mm thru axle
• Tyres: Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40" (XS: 27.5x2.40")
• Brakes: Tektro Gemini SL 4 piston hydraulic brake
• Handlebars: Bontrager Comp, alloy, 31.8 mm, 40mm rise, 780 mm width
• Grips: 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: Bontrager Line Dropper, MaxFlow, internal routing, 31.6 mm, S: 100 mm travel, 310 mm length M/L/XL: 170 mm travel, 450 mm length
• Weight:

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