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The Trek Powerfly+ FS 4 Gen 4 is an Alpha Platinum aluminium full-suspension electric mountain bike, powered by a Bosch Performance Line CX motor and a 600 Wh PowerTube battery. It offers 130 mm of travel at the front and 120 mm at the rear, and weighs 25.28 kg in size M according to Trek. Its Mercury/Dark Web finish pairs a light, mercury-like metallic grey with deep black sections.
| Frame | Alpha Platinum aluminium, removable integrated RIB 2.0 battery, Motor Armor protection, Mino Link adjustable geometry, adjustable suspension leverage, ABP, UDH hanger, Boost148, rack and mudguard mounts |
| Motor | Bosch Performance Line CX, 250 W rated, assist up to 25 km/h (European version) |
| Battery | Bosch PowerTube 600 Wh, smart system |
| Controls / display | Bosch Purion 200 |
| Suspension | RockShox Recon Silver RL Solo Air 130 mm with lockout / RockShox Deluxe Select R 210x50 mm, 120 mm |
| Drivetrain | Shimano CUES U6000 GS 1x10, 36T chainring (165 mm cranks), LinkGlide LG300 11-48 cassette |
| Brakes | Tektro Gemini SL 4-piston hydraulic, 203 mm rotors front and rear |
| Wheels / tyres | Shimano TC500 hubs, Bontrager Line TLR 30 rims / Bontrager Gunnison Pro XR 2.40 Tubeless Ready (29 in, 27.5 in for S) |
| Cockpit | Bontrager Comp alloy 780 mm handlebar, 40 mm rise, Bontrager Comp 50 mm stem |
| Saddle / seatpost | Bontrager Verse P3 / Bontrager Line Dropper 100 mm (S) or 170 mm (M to XL) |
| Weight | 25.28 kg in size M (Trek figure) |
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At a glance
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For the hiker or occasional mountain biker who wants to discover the trails of the hinterland without dreading the climbs, and for whom a non-assisted mountain bike limited their rides. It also suits a couple where one partner rides less often and wants to keep up.
Alpha Platinum, the aluminium behind the FS 4. Trek uses its Alpha Platinum aluminium for this frame, one notch below the Alpha NEXT Platinum of the alloy Fuel+ models. On this FS 4, two frame details matter day to day: the RIB 2.0 battery comes out in one piece for charging at home, held by a second latch that stops it from falling out, and the Motor Armor skid plate protects the Bosch motor from stones flicked up under the bottom bracket.
| Alpha Platinum (Powerfly+ FS) | Alpha NEXT Platinum (Fuel+ EX 8) | OCLV Mountain (Rail+ 9.7 / 9.8) | |
| Level | Proven mountain bike aluminium, sensible budget | Trek's most advanced mountain bike aluminium | Trek's off-road carbon |
| Construction | Shaped tubes reinforced around the motor | Finer forming, smoothed welds | Compacted fibres, impact-resistant lay-up |
| Reference bike | Powerfly+ FS 4, 25.28 kg (M) | Fuel+ EX 8 (TQ motor) | Rail+ 9.7, 23.73 kg (M) |
| What it means | Tough and repairable, higher weight | Lighter frame for a lightweight e-MTB | Fewer grams, bigger budget |
Put simply: the FS 4 puts the money where it matters on a first full-suspension e-MTB, namely the Bosch CX motor, front and rear suspension and four-piston brakes. The 10-speed CUES drivetrain and 600 Wh battery stay simple; they are also the two areas that set this version apart from its bigger siblings.
The Bosch CX is the benchmark motor for powerful e-MTBs: its assist builds progressively with your effort, which avoids jolts in hairpins. Like any e-bike type-approved in Europe, it delivers 250 W rated and cuts the assist at 25 km/h. On the rocky tracks around Béziers, the 120 mm rear suspension keeps the wheel in contact with the ground and the assist stays usable where a hardtail would bounce around.
The Bosch Purion 200 controller stays compact on the bar and displays the essentials: mode, battery level, speed. System updates go through the Bosch eBike Flow app on your phone, and we can also do them in the workshop during a service.
| Model | Motor / battery | Rear / front travel | Drivetrain | Weight (M) |
| Powerfly+ FS 4 | Bosch CX / 600 Wh | 120 / 130 mm | Shimano CUES 10-speed | 25.28 kg |
| Powerfly+ FS 4 Equipped | Bosch CX / 600 Wh | 120 / 130 mm | CUES 10-speed + rack | 26.50 kg |
| Powerfly+ FS 4 800 Wh | Bosch CX / 800 Wh | 120 / 130 mm | Shimano CUES 10-speed | 25.50 kg |
| Powerfly+ FS 5 | Bosch CX / 800 Wh | 120 / 160 mm | Shimano Deore/XT 12-speed | 24.58 kg |
Our take: at 25.28 kg in M, the FS 4 is the simplest Powerfly+ FS. For 220 g more, the FS 4 800 Wh gives you an extra 200 Wh of reserve; to move up to 12 speeds and Shimano brakes, the FS 5 drops to 24.58 kg.
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LVR sizing advice If you are between sizes on an e-MTB, the smaller one is easier to handle on foot (pushing, loading into the car), while the larger one adds stability on descents. Size S rolls on 27.5 inch wheels with a 100 mm dropper post, the other sizes on 29 inch wheels with 170 mm.
Source: Trek size guide. Bike fitting available in our Béziers shop. |
| Do I need mountain bike experience? | No, the assist and full suspension make your first trails accessible; we set up the bike for your weight. |
| Does the battery come out? | Yes, the PowerTube 600 Wh comes out of the frame thanks to the RIB 2.0 system so you can charge it at home. |
| What does the lever on the fork do? | It locks out the Recon Silver RL for road sections or smooth tracks. |
| Does the mercury grey show the dirt? | Less than white; a rinse with clean water after a muddy ride is enough. |
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The LVR Cycles verdict A complete full-suspension electric mountain bike to get started, with the most widespread Bosch motor and reassuring four-piston brakes. Its mercury grey and black stays understated and ages well.
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Why buy from LVR Cycles? As a Trek retailer in Béziers, we hand over your Powerfly+ FS 4 fully set up (suspension pressures, saddle height) with an introduction to the Bosch system and the Flow app.
Please note that the specifications may be changed without prior notice by the manufacturer, based on the availability of components and other factors.
Data sheet
Specific References
Aluminium full-suspension electric mountain bike Trek Powerfly+ FS 4 grey: Bosch CX 600 Wh, 130/120 mm, 25.28 kg
