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Available here in sizes L and XL, for riders from 177 to 195 cm, the Trek Powerfly+ FS 6 Gen 4 is an aluminium full-suspension electric mountain bike with a Bosch CX motor and an 800 Wh PowerTube battery. Fox suspension with 130 mm at the front and 120 mm at the rear, 12-speed Shimano drivetrain: Trek quotes 25.08 kg in size M. The Era White/Buff Beige colourway pairs a bright off-white with touches of sandy beige.
| 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 tall and rather heavy mountain biker, who puts more demand on the motor, brakes and battery, and is looking for an e-MTB that can last all day without recharging. It is aimed at those who ride in the mountains as much as on lowland tracks.
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.
A tall, heavier rider uses more energy on climbs: this is where the 800 Wh battery really makes sense, as it saves you heading home in eco mode halfway round. The four-piston Shimano brakes and 203 mm rotors front and rear dissipate heat better, which matters when the combined weight of rider and bike is high.
Both sizes offered roll on 29 inch wheels with a 170 mm Line Dropper post, enough to get the saddle completely out of the way on the descents of the Caroux. The assist, compliant with European rules (250 W rated, cut-off at 25 km/h), 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 an identical battery and motor, this FS 6 weighs 25.08 kg in M, the same as the FS 6 with a 140 mm Fox 36 fork. The FS 8 with wireless shifting drops to 24.48 kg; the FS 4 800 Wh stays at 25.50 kg with 10 speeds.
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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. |
| Why only L and XL? | This colourway is offered here in those two sizes; the black version comes in S to XL. |
| Does the white get dirty quickly? | It shows dust, but cleans easily with water and mild soap. |
| Are the brakes up to the job for a heavier rider? | Yes, four pistons and 203 mm rotors; an annual bleed keeps them consistent. |
| Can the geometry be adjusted? | Yes, the Mino Link insert offers two positions; we set it according to your terrain. |
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The LVR Cycles verdict An 800 Wh full-suspension e-MTB built for tall riders, with brakes sized for the load. The off-white and sandy beige give it an elegance rarely seen on a mountain bike.
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Why buy from LVR Cycles? As a Trek retailer in Béziers, we adjust the Fox suspension pressures to your weight, bleed your brakes and look after the Bosch system on your Powerfly+ FS 6.
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