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With its 800 Wh Bosch PowerTube battery and Performance Line CX motor, the Trek Powerfly+ FS 6 Gen 4 is built for days when the climbing piles up. 130 mm Fox AWL fork, 120 mm Fox Float Rhythm shock, 12-speed drivetrain with Shimano XT derailleur: Trek quotes 25.08 kg in size M. Its Gloss Dark Star/Matte Dark Web finish plays on two blacks, gloss and matt.
| 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 800 Wh, smart system |
| Controls / display | Bosch Purion 200 |
| Suspension | Fox AWL Rail 2.0 130 mm, Kabolt 15 mm axle / Fox Float Rhythm 2-position 210x50 mm, 120 mm |
| Drivetrain | Shimano 1x12: XT M8100 long-cage derailleur, Deore M6100 10-51 cassette, Deore chain |
| Brakes | Shimano 4-piston hydraulic, M6100 levers, M6120 calipers, RT64 203 mm rotors |
| Wheels / tyres | Shimano TC500 hubs, Bontrager Line TLR 30 rims / Gunnison Pro XR 2.40 Tubeless Ready |
| Cockpit | Bontrager Comp 780 mm handlebar, 40 mm rise, Bontrager Comp 50 mm stem |
| Saddle / seatpost | Bontrager Verse P3 / Bontrager Line Dropper, 100 mm in S, 170 mm from M upwards |
| Weight | 25.08 kg in size M (Trek figure, with tubeless sealant, no inner tubes) |
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At a glance
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For the mountain biker who heads out for the day towards the Espinouse or the Montagne Noire, links climb after climb and wants to get home without counting every percent of battery. It is also aimed at groups where everyone rides an e-MTB and loops often exceed 50 km.
Alpha Platinum and Mino Link, a frame you can adjust. On this version, it is the Mino Link adjustable geometry that deserves attention: a small reversible insert at the rocker link slightly changes the bottom bracket height and the frame angles. High setting to keep the pedals clear of rocks on technical climbs, low setting for a more planted feel on fast descents. All on Alpha Platinum aluminium that takes the punishment without complaint.
| Alpha Platinum (Powerfly+ FS) | Alpha NEXT Platinum (Fuel+ EX 8) | OCLV Mountain (Rail+ 9.7 / 9.8) | |
| Level | Tough aluminium of the Bosch e-MTBs | Top of Trek's aluminium ladder | OCLV carbon, mountain bike version |
| Construction | Adjustable frame (Mino Link, leverage) | Slimmer tubes, smoothed welds | Carbon moulding, main frame |
| Reference bike | Powerfly+ FS 6, 25.08 kg (M) | Fuel+ EX 8 | Rail+ 9.7, 23.73 kg (M) |
| What it means | Withstands crashes, easy to repair | Weight saving on the frame | Around 1.35 kg lighter than this FS 6 |
Put simply: this FS 6 brings together three upgrades over the FS 4: the 12-speed drivetrain, the 800 Wh battery and Fox suspension. At 25.08 kg in M, it weighs 200 g less than the 600 Wh FS 4, while carrying 200 Wh more.
The long-cage Shimano XT derailleur handles the Deore 10-51 cassette precisely, even under the motor's torque. The 51-tooth sprocket lets you climb steep ramps at a high cadence, which takes the strain off the motor and saves battery. We recommend easing off the pedals for a moment as you shift.
The Fox Float Rhythm shock offers two positions: open for descents, firmer for long link tracks. Bosch limits the assist to 25 km/h, with 250 W rated, in line with the European standard; beyond that, it's down to your legs. The Purion 200 controller is updated via the Bosch eBike Flow app.
| Model | Motor / battery | Rear / front travel | Drivetrain | Weight (M) |
| Powerfly+ FS 4 800 Wh | Bosch CX / 800 Wh | 120 / 130 mm | Shimano CUES 10-speed | 25.50 kg |
| Powerfly+ FS 6 (Fox AWL) | Bosch CX / 800 Wh | 120 / 130 mm | Shimano XT/Deore 12-speed | 25.08 kg |
| Powerfly+ FS 6 (Fox 36) | Bosch CX / 800 Wh | 120 / 140 mm | SRAM Eagle 70 12-speed | 25.08 kg |
| Powerfly+ FS 8 (GX AXS) | Bosch CX / 800 Wh | 120 / 130 mm | Wireless SRAM GX AXS | 24.48 kg |
Our take: with 800 Wh, this FS 6 weighs 200 g less than the 600 Wh FS 4 (25.28 kg) and 420 g less than the FS 4 800 Wh. For the Kiox 300 display and wireless shifting, the FS 8 drops to 24.48 kg.
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LVR sizing advice If you are unsure, remember that the assist hides some of the weight on climbs, but not on descents: the right size is the one that makes you feel at ease standing on the pedals. Size S uses 27.5 inch wheels and a 100 mm dropper.
Source: Trek size guide. Bike fitting available in our Béziers shop. |
| How much climbing can I do with 800 Wh? | It depends on weight, mode and terrain; we can help you estimate it based on your rides. |
| Can I carry a second battery? | The RIB 2.0 battery can be swapped in a few seconds; ask us about compatibility. |
| Does the matt black scratch? | It marks where it rubs; a protective film fitted in the workshop preserves it. |
| Is a mix of XT and Deore reliable? | Yes, a precise XT derailleur and a robust Deore cassette work together without any problem. |
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The LVR Cycles verdict An enduring full-suspension e-MTB, with a big battery and a well-spaced 12-speed drivetrain for long climbs. Its two blacks, gloss and matt, give it a sober, classy look.
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Why buy from LVR Cycles? In Béziers, we prepare your Powerfly+ FS 6 for long rides: Fox set-up, advice on battery management and servicing of the 12-speed drivetrain.
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 6 black: Bosch CX 800 Wh, 10-51, 25.08 kg
